OS: MacOS Intel
When I click on the update link the updater just flashes for a second or two and quits Wappler. It also uninstalled 6.8.0?
On MacOS Apple Silicon it worked fine
Edit: I updated from Beta to RC2
Same. Mac Intel. Downloading from the Account Dashboard works fine.
I'm on Mac Silicon and the auto update isn't working (from rc1 to rc2). It downloads, quits and then does nothing. When I launch it again it's still on rc1.
Did it also uninstall 6.8.0 for you?
Worked fine for me on Mac with Apple Silicon processor (RC1 to RC2), 6.8.0 was not uninstalled.
Good point. I hadn't noticed but yes, 6.8 is no longer installed. 
Well I couldn't find any problems with the inline update/
Seems like you somehow started the update from Wappler 6.8.0, so that is why it removed it.
Anyway doing a full install manually will solve everything.
Maybe I'd suggest to prevent non-Beta to Beta updates
No, that is not the case. I started the update from RC1 to RC2 from the notification link from within the app. I was definitely running RC1 at the time.
Same here, was definitely from RC1. I don't ever open 6.8.0.
Same here. I've not run 6.8 this year which is why I didn't notice it had been removed until @brad asked me.
Update: I've now reinstalled 6.8 and installed 7rc2 manually and all is well again.
I experienced the same
Fyi, just done update on Windows, no issues.
Found the problem. Was indeed a wrong check for beta update while we are in RC stage now.
Will fix it in the next RC, but you will have to manually update to to it, otherwise you will get the same problem, as it is also in RC 2
Fixed now in the just released RC 3, but as noted, you will have to do a manual download and install if you are upgrading from a previous RC version.