Read the good news for the intel version for Mac, and quickly downloaded. Installed fine, saved the log for reference, if needed.
The setup failed with these errors -
mini02:/opt/zimbra/libexec root# ./zmsetup.pl
Checking java version...1.5 found
Operations logged to /tmp/zmsetup.log.1376
Setting defaults...Setting defaults from existing config...Warning: null valued key 'mysql_logger_root_password'
Upgrading from to 3.1.0_GA_260
Sat Mar 25 00:00:21 2006: Stopping zimbra services
Sat Mar 25 00:00:24 2006: Stop failed - exiting
UPGRADE FAILED - exiting