Still sticks at the same spot after installing ffdshow 64-bit

Even with the offline installer, it gets stuck at the same component, although much earlier in the installation. I tried installing it on two other drives just now.

It always gets stuck after *SVP\script\base.avs

Tried letting it go for 40 minutes, then rebooting after uninstalling, and it's again at this.
https://i.imgur.com/OdIfvDk.png
No additional anti-virus installed.

This is what the installation went through.

Preparing the installation...

Downloading packages...
Downloading archive "122i18n.7z.sha1" for component Language files.
Downloading archive "122i18n.7z" for component Language files.
Downloading archive "14.16.27027content.7z.sha1" for component Microsoft VC++ 2017 redistributable 32-bit.
Downloading archive "14.16.27027content.7z" for component Microsoft VC++ 2017 redistributable 32-bit.
Downloading archive "5.12.2iconengines.7z.sha1" for component Qt 5.
Downloading archive "5.12.2iconengines.7z" for component Qt 5.
Downloading archive "5.12.2imageformats.7z.sha1" for component Qt 5.
Downloading archive "5.12.2imageformats.7z" for component Qt 5.
Downloading archive "5.12.2platforms.7z.sha1" for component Qt 5.
Downloading archive "5.12.2platforms.7z" for component Qt 5.
Downloading archive "5.12.2styles.7z.sha1" for component Qt 5.
Downloading archive "5.12.2styles.7z" for component Qt 5.
Downloading archive "5.12.2content.7z.sha1" for component Qt 5.
Downloading archive "5.12.2content.7z" for component Qt 5.
Downloading archive "2manual.7z.sha1" for component User manual.
Downloading archive "2manual.7z" for component User manual.
Downloading archive "4.3.0.160-1licenses.7z.sha1" for component SVP Manager (Pro).
Downloading archive "4.3.0.160-1licenses.7z" for component SVP Manager (Pro).
Downloading archive "4.3.0.160-1script.7z.sha1" for component SVP Manager (Pro).
Downloading archive "4.3.0.160-1script.7z" for component SVP Manager (Pro).
Downloading archive "4.3.0.160-1content.7z.sha1" for component SVP Manager (Pro).
Downloading archive "4.3.0.160-1content.7z" for component SVP Manager (Pro).
Downloading archive "1.2.3-1licenses.7z.sha1" for component Additional utilities.
Downloading archive "1.2.3-1licenses.7z" for component Additional utilities.
Downloading archive "1.2.3-1utils.7z.sha1" for component Additional utilities.
Downloading archive "1.2.3-1utils.7z" for component Additional utilities.
Downloading archive "1.2.3-1content.7z.sha1" for component Additional utilities.
Downloading archive "1.2.3-1content.7z" for component Additional utilities.
Downloading archive "4.0.0-6content.7z.sha1" for component SVP Manager (Pro).
Downloading archive "4.0.0-6content.7z" for component SVP Manager (Pro).
Downloading archive "4533content.7z.sha1" for component ffdshow 32-bit.
Downloading archive "4533content.7z" for component ffdshow 32-bit.
Downloading archive "14.16.27027content.7z.sha1" for component Microsoft VC++ 2017 redistributable 64-bit.
Downloading archive "14.16.27027content.7z" for component Microsoft VC++ 2017 redistributable 64-bit.
Downloading archive "2728content.7z.sha1" for component Avisynth+.
Downloading archive "2728content.7z" for component Avisynth+.
Downloading archive "4.3.0.160licenses.7z.sha1" for component [DS_32] Core for DirectShow 32-bit.
Downloading archive "4.3.0.160licenses.7z" for component [DS_32] Core for DirectShow 32-bit.
Downloading archive "4.3.0.160plugins.7z.sha1" for component [DS_32] Core for DirectShow 32-bit.
Downloading archive "4.3.0.160plugins.7z" for component [DS_32] Core for DirectShow 32-bit.
Downloading archive "4533content.7z.sha1" for component ffdshow 64-bit.
Downloading archive "4533content.7z" for component ffdshow 64-bit.
Downloading archive "4.3.0.161plugins64.7z.sha1" for component [DS_64] Core for DirectShow 64-bit.
Downloading archive "4.3.0.161plugins64.7z" for component [DS_64] Core for DirectShow 64-bit.
Downloading archive "3.7.1licenses.7z.sha1" for component Python 3 64-bit.
Downloading archive "3.7.1licenses.7z" for component Python 3 64-bit.
Downloading archive "3.7.1mpv64.7z.sha1" for component Python 3 64-bit.
Downloading archive "3.7.1mpv64.7z" for component Python 3 64-bit.
Downloading archive "45mpv64.7z.sha1" for component [VPS_64] VapourSynth 64-bit.
Downloading archive "45mpv64.7z" for component [VPS_64] VapourSynth 64-bit.
Downloading archive "4.3.0.161plugins64.7z.sha1" for component [VPS_64] Core for Vapoursynth 64-bit.
Downloading archive "4.3.0.161plugins64.7z" for component [VPS_64] Core for Vapoursynth 64-bit.
Downloading archive "2019.5.11extensions.7z.sha1" for component youtube-dl engine.
Downloading archive "2019.5.11extensions.7z" for component youtube-dl engine.
Downloading archive "2019.5.11licenses.7z.sha1" for component youtube-dl engine.
Downloading archive "2019.5.11licenses.7z" for component youtube-dl engine.
Downloading archive "4.1licenses.7z.sha1" for component ffmpeg 32-bit static build.
Downloading archive "4.1licenses.7z" for component ffmpeg 32-bit static build.
Downloading archive "4.1utils.7z.sha1" for component ffmpeg 32-bit static build.
Downloading archive "4.1utils.7z" for component ffmpeg 32-bit static build.
Downloading archive "120-2extensions.7z.sha1" for component SVPtube Language files.
Downloading archive "120-2extensions.7z" for component SVPtube Language files.
Downloading archive "3.7.1licenses.7z.sha1" for component Python 3 32-bit.
Downloading archive "3.7.1licenses.7z" for component Python 3 32-bit.
Downloading archive "3.7.1mpv32.7z.sha1" for component Python 3 32-bit.
Downloading archive "3.7.1mpv32.7z" for component Python 3 32-bit.
Downloading archive "3.2-502mpv32.7z.sha1" for component PythonQt.
Downloading archive "3.2-502mpv32.7z" for component PythonQt.
Downloading archive "2.1.0.161extensions.7z.sha1" for component SVPtube 2.
Downloading archive "2.1.0.161extensions.7z" for component SVPtube 2.

Installing component Language files
H:\Programs\SVP4\i18n
H:\Programs\SVP4\i18n\bg.qm
H:\Programs\SVP4\i18n\de.qm
H:\Programs\SVP4\i18n\en.qm
H:\Programs\SVP4\i18n\es.qm
H:\Programs\SVP4\i18n\fr.qm
H:\Programs\SVP4\i18n\ja.qm
H:\Programs\SVP4\i18n\ko.qm
H:\Programs\SVP4\i18n\pl.qm
H:\Programs\SVP4\i18n\pt-br.qm
H:\Programs\SVP4\i18n\ru.qm
H:\Programs\SVP4\i18n\sr.qm
H:\Programs\SVP4\i18n\uk.qm
H:\Programs\SVP4\i18n\vi.qm
H:\Programs\SVP4\i18n\zh-cn.qm
H:\Programs\SVP4\i18n\zh-tw.qm

Installing component Microsoft VC++ 2017 redistributable 32-bit
C:\Users\Metal\AppData\Local\Temp\qtifw-PtOlat\vcredist_2017_x86.exe

Installing component Qt 5
H:\Programs\SVP4\libeay32.dll
H:\Programs\SVP4\Qt5Concurrent.dll
H:\Programs\SVP4\Qt5Core.dll
H:\Programs\SVP4\Qt5Gui.dll
H:\Programs\SVP4\Qt5Network.dll
H:\Programs\SVP4\Qt5Qml.dll
H:\Programs\SVP4\Qt5Svg.dll
H:\Programs\SVP4\Qt5Widgets.dll
H:\Programs\SVP4\Qt5WinExtras.dll
H:\Programs\SVP4\ssleay32.dll
H:\Programs\SVP4\iconengines
H:\Programs\SVP4\iconengines\qsvgicon.dll
H:\Programs\SVP4\imageformats
H:\Programs\SVP4\imageformats\qgif.dll
H:\Programs\SVP4\imageformats\qico.dll
H:\Programs\SVP4\imageformats\qjpeg.dll
H:\Programs\SVP4\imageformats\qsvg.dll
H:\Programs\SVP4\platforms
H:\Programs\SVP4\platforms\qwindows.dll
H:\Programs\SVP4\styles
H:\Programs\SVP4\styles\qwindowsvistastyle.dll

Installing component User manual
H:\Programs\SVP4\manual
H:\Programs\SVP4\manual\en.pdf
H:\Programs\SVP4\manual\ja.pdf
H:\Programs\SVP4\manual\ru.pdf
H:\Programs\SVP4\manual\zh-cn.pdf

Installing component SVP Manager (Pro)
H:\Programs\SVP4\ui-scale.txt
H:\Programs\SVP4\SVPManager.exe
H:\Programs\SVP4\SVPManagerLauncher.exe
H:\Programs\SVP4\licenses
H:\Programs\SVP4\licenses\svp4_pro.txt
H:\Programs\SVP4\script
H:\Programs\SVP4\script\generate.js
H:\Programs\SVP4\script\override.js
H:\Programs\SVP4\script\base.py
H:\Programs\SVP4\script\base.avs

Is it possible it's just missing svpflow?

Just in case it's an installation problem--during the installation process, the download hangs at different percentages, but always at the point of "Installing component SVP Manager (Pro)".
https://i.imgur.com/VVRQImH.png
I can click cancel, which "cancels" the installation process and hit it again to close it, and then open the SVP manager.
It didn't install any video player despite selecting it in the install. Pre-installing my own video player and running that gives me this error.
https://i.imgur.com/OnNOKym.png
This happens with both 32-bit and 64-bit players. MPC-HC and MPC-BE, with and without any additional codec packs.

The SVP site tells me to download svpflow based on the engine error, but not how to install it. I can't even download it through the SVP manager because going to Utilities > Additional programs and features... doesn't open any new windows. I downloaded svpflow from the website manually, but I'm at a loss with what to do with these files.