Serious transcoding questions

Hi SVP project users/developers,

The videos I am transcoding are x264 720p/1080p 30/60FPS to 1440P 144FPS. I am still using the spirton guide to convert them. http://www.spirton.com/convert-videos-to-60fps/

I have tried out the SVP transcoding feature (without custom profiles) and find that InterFrame 2.6.0 by SubJunk is still superior in terms of quality, smoothness and artifacts.

However, I can see that this guide has not been updated for years, and no longer supports the latest codecs.

Upon looking at the script I can see smooth_video = SVSmoothFps(Input, Super, Vectors, SmoothString, url="www.svp-team.com", mt=Cores),

where defaults are

super: "scale:{
              up:2,
              down:4
            },
            gpu:0,
            rc:false}"

vectors: "{block:{
                   w:16,
                   overlap:2,
                   main:{
                        search:{
                             distance:0,
                             coarse:{
                                     distance:-10,
                                     bad:{
                                            sad:2000
                                     }
                              }
                         }
                   },
                   refine:[{thsad:250}]
              }"

SmoothString: "{rate:{
                             num:60000,
                             den:1001,
                             abs:true
                         },
                         area:0,
                         area_sharp:1.2},
                        scene:{blend:true, mode:0}
                         }"

And these settings cannot be simply used in SVP code.

Question 1.
Since SVP 4 is a product, is it legal to use latest svpflow plugins in the SVP 4 directory? If so, is there new feature/performance/quality increases?

Question 2.
Transcoding with latest LAV, ffshow, x264 tools with Megui provide correct frames but unable to finish encoding with missing track information. Is there anything I can do about it?

Question 3.
Has anyone compared SVP transcoding and spirton guide to see the difference between them?

Thank you all for reading and enjoy your day!