I haven't had any issues from the install method, but I did have a nasty msvcr100.dll CTD issue. It seems that alot of people are having that. Anyway, I installed the recommended FSUIPC4.dll file and it seemed to help at first. Then suddenly they came back and worse. Every time I booted up the sim, it would CTD as soon as it loaded.
Today I deleted my P3D shader cache (again), and rebuilt my P3D.cfg file, renaming the current one. After restarting this time, it is like a new install, except all my addons work. I must have had some junk in my config file. I turned off Opus weather for now. And also IS3 too.
I started out at Jedway seabase, and cruised my Malibu boat down to the dive site because the water is looking sooo good. I got into my wetsuit and dove the wreck, and swam with the whales. When I was done I surfaced and swam to the main island. I went up to 16,000 feet next, and parachuted down over the area. After landing, I shut down normally. No crash.