

GarageBand 6.0.5 would be running on your Mac, if you just could install the iLife version of GrageBand '11 and run the updater. When I tested again, I am now getting the same message, when I try to run the GB 6.0.5 updater, even with the date set to the past. The advice I have given has been working until recently, and it has been the only option to install GarageBand on El Capitan. It is very difficult to get older versions of the applications for older systems, once the newer system versions are out.

And the current download is still the old version with the error message about "Invalid". I asked the community hosts in this forum to contact the Apple Support team that is responsible for the Download pages with the updaters and they promised to report the problem with the GarageBand 6.0.5 download.
