Slitherine

It's been awhile guys, sorry, but I'd like to see a concise description of the changes for 3.1 before I install the update and possibly mess up my 2.1 update.
The .org FTP site doesn't seem to be available anymore for pdf downloads.
Is there a new location for manuals?

I think I found it (GS Manual 3.1.pdf) dated Sept 21, 2014 which would correspond to CommanderEuropeAtWarGrandStrategy-UpdateComp-v310.zip
Sorry, again.
So I hope I can just make a backup copy of my current installation folder (C:\Program Files (x86)\Slitherine\Commander Europe At War Grand Strategy) and update at that location?

"CommanderEuropeAtWarGrandStrategy-SetupRelease-300.exe" installs and runs, but the 3.1 mod won't run. The splash screen(s) display but it won't start and no log file is created <sigh>. I have a Win7 x64 game box with a couple of high-res monitors.