Howdy @tmeitner and welcome to PhotoStructure! Thanks for taking the time to report this.
PhotoStructure should be statically compiled, but it looks like the alpha.7 build linked to the system libvips.so library instead.
Assuming you’re on Ubuntu 20.04 or later, if you run
sudo apt install libvips42
and then try again, it should launch. If it doesn’t, please tell me!
I’ll fix this in the next build. Apologies for the hassle!