Not installed successfully, cannot proceed

[Chriff]

Hello :)
I wanted to give this project a try and tried to install the Downloader 0.3 release by downloading the exe to
C:\VapourSynth-Super-Resolution-Helper\

A lot of stuff was downloaded and extracted just fine, but at some point i got this message:

So what is weird:

1. "D:\obj\windows-release\37amd64-Release"
   -> This path does not exist. I have a harddisk volume "D:" but "D:\obj..." doesn't exist.
   Also i'm not sure why D matters anyway, since i'm downloading to C.

2. While i have installed a software called "shotgun" which also uses ffmpeg, i can't see why your installer would try to access it. Especially because ffmpeg was already downloaded by your installer before.

Anyway, I hit Enter, and the console closed.
So i tried to start the downloader again, but it says:

Existing VapourSynth Fatpack installation found in this directory. Please delete
 it or move this installer somewhere else!
If you just want to update everything, please use the updater batch file

Press ENTER to continue...

BUT: there is no updater batch file in the extracted folder though.
So it seems i'm stuck...

The extracted "VapourSynth64Portable" folder has a size of ~800mb, so i guess there is still a lot missing.

Do you have any idea what i should do?

Best regards