Upgrading NextcloudPi from 1.15.3 to 1.18 problemsā€¦

ā„¹ļø Support šŸ“¦ Appliances (Docker, Snappy, VM, NCP)
#1

getting this error when downloading the packages:

The repository ā€˜http://ppa.launchpad.net/nextcloud-devs/client/ubuntu focal Releaseā€™ does not have a Release file.

any guesses?