2.2a CTD Unspecified Error

I followed all the instructions for the install, but it looks like something is still up.

Nothing's up, besides having generated the sound files again. Seems to be a thing the game does any time the sounds have been changed, it crashes the first campaign generation afterwards.

While it should be fine to play on afterwards, for safety I'd delete the map.rwm and start a new campaign from there onwards.

I get the CTD during the campaign initial load screen after choosing faction etc. I get a blank screen and the load process hangs up, forcing me to quit the process.

Just give it another go after deleting map.rwm?

Yes, try that.