If you go with OA, build 45 is the latest one (it may give you 44, but on reboot upgrade you to 45 automatically)...reboot twice. Should you need to uninstall, it does so nicely. Just remember to reboot twice in between uninstall and install and upgrades. After reinstallation, make an OA restore point (in your GUI). Also, making Avast a trusted exclusion in OA, and OA an exclusion in Avast may help.
If you decide to go with pctools and need to uninstall someday, make sure you check for remnants in Safe Mode as you WILL find them in there since it does not uninstall cleanly from testing point of view with build 6.0.0.88.