The GOG page does not seem to have the modding toolkit for HMR (unlike, it seems, the Steam release), does anyone of you have access to the modding toolkit, and if yes, can you share it (e.g. drive, dropbox)?

I have not been able to find a way to obtain it in all the internet, it's absurd. Please help.

The cool folks over at the steam forums helped out.

Here are 2 mirrors for the tools, just in case:
https://mega.nz/#!VhQwhCKb!U1itMqsQXy3TM7XyDyj4aAO80-tcIsLdNQmyTrhplb0
https://nofile.io/f/su0GpycPsSr/GBXTools.7z