If I were you, which I am not, I would go to FSX:Steam Edition. It's a DL only, but once you have it installed, you don't have to be online to use it. It's essentially FSX Gold, including Acceleration, with some upgrades to make it work better.
I have FSX:SE, and I've had a total of 1 OOM crashes since I installed it back in '14, when it came out. And I fly it a lot! I've made some of Kosta's changes to the FSX.cfg file, some didn't work for me. I've also made some of the changes from Nick's Bible, and use NVidea Inspector, with Nick's changes to that as well. My scenery is nice and crisp and clean, I don't get hardly any stutters or anything like that, and so on. I can fly low and slow, low and fast as heck, whatever, and it just keeps on working great.
It's also pretty inexpensive, $25.00 USD normally, frequently on sale for $9.00 or less.
PS: DO NOT permit it to install to C:\Program Files or \Program Files(X86). Windows, especially 10, seems to have severe personal problems allowing you to make changes to the sim if you do. Add-on's, aircraft.cfg, whatever. ANYwhere bot those two folders.
Hope this helps a little. Again, all of this is MY personal opinion, for what it's worth.

Pat☺