I haven’t updated yet because I read some posts about some people having problems with it. I want to do a custom install so should I uninstall the version I’m using now before I update?
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Backup your existing Avast Settings. These settings can be applied after an update, whichever one you choose to do.
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Do a system backup image as previously mentioned.
Then you can pretty much do what you like. The Program update was released on 09 October 2018, so 3 weeks is a very long time when you are talking about a program update every month.
Considering there hundreds of millions of Avast users, do you not expect to see some issues reported in a support forum.
I’m uninstalling then going to reinstall
Edit
Now have the new version installed