With 100mb volumes, it failed even earlier, on audio_g.pig.

With 10mb volumes, it fails on the first large file.

Looks like the commonality in all these cases is the switch from PotBS-Install.exe to PotBS-Install.001

However, with 1024mb volumes, it installed successfully. I guess the workaround is to switch back to a monolithic installer that's too big for Windows to find the application icon.