great, so you could just said you got "Tube loader: can't load tube plugin" error message from the beginning
loading svptube is a little bit tricky, maybe something is wrong with installation or environment in your case
extensions\svptube.dll modifies PATH env var and loads extensions\tube\main.dll, which depends on mpv32\PythonQt.dll, which in turn depends on mpv32\python35.dll and MS VC++ 2015 32-bit runtimes
so please check that
- SVP 4\mpv32 exists and contains pythonqt.dll and all Python files
- VC++ 2015 32-bit runtimes installed
- post here output of 'echo %PATH%' command