Absolutely!
I thought I could get away with installing over top of 4.8.
What a mistake. All kinds of problems ensued.
I then uninstalled 5 and reverted back to 4.8.
I decided to attempt installing 5 again, but this time I uninstalled 4.8 completely and ran the Avast cleaner tool in safe mode and rebooted twice.
Nary a problem now.
I don't understand why Avast and all the moderators on this board are not advising people to uninstall 4.8 first.
It should be a sticky.............................
I should add, that make sure you download 5.0.396, I think it's the latest, and from what I've heard, the most trouble free.
Good luck.