I got a shader compilation error when tried to open the .exe on Milton_1.5.1_Standalone_x64 .
I'm using a Windows 7

I don't know if serge_rgb comes here often. The help page on the Milton site has an e-mail, you might get a faster reply there. One possible problem would be that your hardware doesn't support OpenGL 3.2, which is the minimum version required for Milton (from this posts near the end).

Hey. Thanks for posting. Probably the best place to report Milton errors is on the github page.

I recently made some changes to GL loading code and Milton should work on way more hardware now if you check out the master branch. I haven't made a release in a long while. I'm waiting to rehash the UI before I do a release. I don't think the latest changes will fix your problem, but it might give you more useful error messages in any case. I'm assuming you're a technical person as this is the handmade network site, but let me know if you that's not correct

Thanks Mrmixer and Serge for your responses. I'm a programmer too but I had only tried the executable, cause I was a little reluctant of installing VS15 and in fact my hardware is old (nvidia NVS 5400m), so I wasn't very hopeful.
Anyway I tried the compilation now and I was able to get an exe.
But now I an error message saying im missing api-ms-win-core-libraryloader-l1-2-0.dll (and after I got that, missing l1-2-1...).

Soon I'll have a new computer and probably it will run without this issues, but for now that's whats holding me

Those dll's come from Universal CRT Runtime: https://www.microsoft.com/en-us/download/details.aspx?id=48234