cannot update Garageband from 6.0.4 to 6.0.5 on my iMac
I'm running OSX 10.7.3 on a new iMac, which came with Garageband 6.0.4. I did a recording at a friend's home
using his iMac with Garageband 6.0.5 and it won't play on my iMac. Yet I can't update my 6.0.4 to 6.0.5 with either
the AppStore (it says that 6.0.5 is "installed") or with
"Software update" (it says I'm up-to-date) or
by downloading 6.0.5 from Apple (it says "the version on this computer must be updated through the App Store").
Any ideas?
GarageBand (Mac) '11, Mac OS X (10.7.3)