Hi,
A few weeks ago, I had encountered the same problem/error. Did all the possible solutions given by admin, friends, forum, and my BFF Google :) but nothing happened.
I found out that my laptop has some virus and won't allow me to update or even install antivirus.
There's a guide on YouTube on how to "Refresh your laptop/pc w/o deleting your files". It's like a reboot, not sure if that is how they call it, and it worked. I was able to reinstall both an antivirus and fRO.
PS: That "refresh your pc thing" was my last option at that time. I'm sure Admin has some better options/suggestion for you :).
Hope this help ^^