Hi!
I just reinstall zenphoto after a while.
Same problem,
"A configuration error occurred.
Please return later." the setup page do not run, and I found this post.
Here is the error log:
[core:error] [pid 17337:tid 139693676984064] [client x.x.x.x:60946] AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
I haven't the skill to investage further, but I can give access to a test website (ftp login ...)
It is running php 7.4