Due to an influx of spam, we have had to approve account registrations. Please write an email to support@manjaro.org, with your username, if you want to get access faster. Sorry for the inconvenience.
Just noticed that the user .cache folder for pamac-qt has the nickname of developer. Inside there is a Pamac QT folder indeed, with the qmlcache, but i think the nickname can be dropped on future release.