Try version 3.34.
http://deepskystacker.free.fr/english/index.html click on the 3.3.4 link.
I run this app on a Windows 10 VM in a VirtualBox on macOS and allocated just one GB to Windows, so very confined.
So 16GB on native windows will not be a problem at all.
Runs like a charm. 25 frames of 25MB each (EOS 6: 20MP full CR2) works fine.
DO NOT USE the drizzle setting, that is applying for a crash or hang.
I tried PI a year ago, but I consider it very unintuitive, so I am not gonna pay $370 (A$500) for this app.