Insert the DVD and select the third option upon clicking a disabled instrument. If you have your iLife DVD, you can easily manually instal the missing update from the DVD. As for the rest of you who want to help me out, please share any information you think is relevant! if anyone else is having this problem, I implore you to give that a try and tell me if it works or not. I thought maybe burning the DMG image to a DVD and having GarageBand read that might work.
Does anyone have any clues or any ideas on how to remedy this situation. I've googled it loads of times in tons of different ways (the suggestions also pop up, so I know other people out there are looking for the same thing I am) but I just can't find it. I'm thinking the only way to fill in the instrument gaps in my copy of GarageBand is to hope that update has been isolated somewhere else that I can download it from other than Software Update. GarageBand Instruments and Apple Loops, it's 1.1 GB and version 1.0 Can I trick it to read a DMG as a DVD? Is there a way around the Software Update? so when I click "Install" it says, "Please insert the iLife DVD!" even though I have the iLife DMG image mounted to my computer. so then I try to install from DVD, only problem is. The package may have been tampered with or corrupted since being signed by Apple." I imagine this is Apple's Anti-Piracy mechanism. The specific error message I get after download and pre-install is, "The digital signature for this package is incorrect.
The download went smoothy, but upon installation it said it couldn't be done for one reason or another. My first idea was to download via Software Update (the Internet option I mentioned earlier). it asks for me to install it either from the internet, from the iLife DVD, or later. I go to use an instrument that has an arrow pointing right to the right of the name.