I am having a similar issue. I've got Norton 360 Deluxe and it really, REALLY wants to kill RF9.5. I disabled all protection and was able to install the software. Then, suddenly a day later, it killed the .exe file again! This has happened twice now. Sigh. Any ideas?
I had to wait for my copy of Rf9.5 to get to Minnesota ( with Interlink DX ) so I had time to clean-up this Dell gamer that I bought to dedicate to the Sim. I spent about 30 days cleaning it up... removing Cortana, unloading all third party AV from the system including McCafree, Norton, couple others... turning off all the marketing nag ware, add ware, bloat ware, and etc.
When Rf9.5 got here, I installed it; no hits, no runs, no errors! Runs fine, as does Windows 10, without Norton and Co, nor McCafree and Co, and without any help from Cortana! Windows defender is all you need to have running; that, and stay off the porn sites! Your machine will be fine, and you'll have a ton of fun with your Sim.