After many wasted hours, the suggestion above allowed me to install the Ventura beta on an external USB-C drive. (2020 Mac mini M1., SanDisk Extreme 55AE) Many thanks to @linusK!
Mr. Fantatsic
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for