I don't know if my past experiences with installing XRM can help anyone, but I'll post some of the minor problems I have had and things I've noticed/did that seemed helped.
I have experienced 'minor issues' whenever I did a fresh (re)install of XRM or an update.
"Military" and "Advanced" scanners would still be 'vanilla' triplex and duplex scanners, a product at the Research Stations showed up as a "number" (something like 14-147) which I believe turned out to be 'Cartography Chips', there were a few other "minor" things that didn't seem to work, but my game was definitely play-able.
On previous installs, I would 'copy-and-paste' as instructed, some issues still remained.
Then I would move each file, one at a time, to the appropriate place. This helped sometimes, but not all of the time.
Finally, and this is how I will install any and all new XRM updates, I used Cycrow's Plugin Manager.
Once I run the PI Manager, I run it again--just to make sure.
All the 'minor' issue I noticed were corrected. It seems XRM is installed 99.999%, and I haven't noticed/found the .001% yet.
I don't know if using the P-I Manager will help others but it helped me and I don't see it being recommended as a possible aid to those new to XRM. It is mentioned as a possible part of the installation instructions in post #2 for non-Steam games.
I do experience hesitation in my game-play from time to time. This is usually after I've been on my game system for a while. The computer I play XRM on is an off-line system that I purchased strictly for games. It doesn't have security software installed (or running). It's never been connected to the internet so I'm sure there is no "bad stuff" secretly installed and running in the background.
Seems my system is just getting too hot, after a couple hours playing XRM. I don't get this as much/soon when I play other games. But my room is 5+*(f) warmer then it should be.
I've taken to opening my tower and cleaning the fans and screens about every two weeks. Using some canned-air to blow out any dust/hair/"what the hell is that" from my system's interior.
This has helped, but not by much.
I heard it said that XRM is very CPU intensive and mine is just heating up too much. This takes a couple of hours, but it is noticeable.
As I've stated previously, I'm going to upgrade my XP to 7 and add RAM taking me from 4 to at least 8G. I will also be adding an other fan or two.
Or maybe I'll just get off my butt after 4 hours and do something, like eat, or shower, or check if the cat is still alive
Anyway, keeping my system's fans and screens clear of "crap" and using Cycrow's PlugIn Manager has helped me. Maybe one or both can be helpful to others.
I'm going to go eat now.
And take a shower.
Then figure out how 1 cat turned into 3 cats

--I know how you can make this Mod play like vanilla..
--Play vanilla!