Okay, that’s fine then 😉
IIRC, the Team Blu upscale, which is where the Despecialized GOUT sources come from, was a mix of custom Avisynth scripts and good old fashioned hand-editing. There were a lot of steps (not necessarily in this order): inverse telecine (which involved manual work, because there were frames that didn’t IVTC cleanly), stabilization, upscaling, cleanup (glue marks and other damage, again by hand), and color correction.
The upscaling itself was done with a “secret sauce” avisynth script, but there are people here with a pretty good idea of how to get results approximately as good. nnedi2_rpow2(rfactor=2, cshift=“spline64resize”, fwidth=1280, fheight=720) gives pretty good results AFAICT, but AviSynth is not really my area of expertise.