I presume you were playing the link in the first post of just fe8 with skills.
Unfortunately that probably doesn’t give us enough to go on for bug fixing.
I would recommend opening up the game in FEBuilder, creating savestates right before it happens, and explaining the issue as best you can eg. “when I hover over the unit at coords 4x,7y, the game crashes” in a report.7z. See the first post below on creating a bug report file.
Alternatively if you can attach your savestates along with the ups file you used in that thread, that would also work.