osmanthus wrote:
One thing worth mentioning (while being on the Mac with the older OS, in my case 10.13.6 High Sierra, where you want to install Logic) is that when you press the "Purchased" tab while logged into the Mac App Store (which will list all your app purchases and free downloads) and press the "Install" button next to Logic Pro is that you'll get an error message ("Logic Pro failed to download. Use the purchased page and try again").
Not to worry though. Just go to the app info page for Logic Pro (or use the search function in the App store to find it) where you press the "Install" button:
Yes, the App Store has had such glitches since last December. There are tons of threads on this topic here. Mojave App Store being the worst offender.
Regarding the different versions: is there only one version of Logic for each OS version?
No idea, but likely so.
So there's no point in installing say MacOS 10.13, 10.13.1, 10.13.2 and download Logic from each of those because they will all result in Logic 10.4.8?
Nope.
(I assume any songs I make with this version won't work with older versions though).
I tested this, and I can open and edit a test project I created with v10.6.1 in 10.3.3 showing me a corresponding warning. But as long as you don't use any of the new features, it should work.
I noticed that the first time I opened Logic I was asked if I wanted to download some essential sounds and loops. Where are they located,
Mainly:
/Library/Application Support/GarageBand
/Library/Application Support/Logic
/Library/Audio/Apple Loops
/Library/Audio/Impulse Responses
and does every version of Logic have different collections of these?
That's what I need to inspect yet, as I don't want to store multiple sound libraries on each partition either. My El Capitan sound library is slightly different though because it also contains old Logic 9 library. I just haven't checked what the exact differencies are yet, and how they would affect any projects I've done so far.
In fact, since my Catalina partition is only 64 GB in total, I had to relocate the sound library anyway. In the newer versions that can be done via Logic Pro menu > Sound Library > Relocate Sound Library.
However, you can't relocate it onto a volume that already has Logic installed.
So my trick was to create a sparse bundle disk image of ca. 100 GB on the El Capitan partition which is 1.5 TB, relocate the basic Catalina sound library there, then download the full sixty-something GB worth of files. The disk image is in my Startup Items so it will automatically mount when I log in on Catalina.
Heck, in fact I have "outsourced" the actual Logic Pro.app to a special folder in El Capitan's /Users/Shared as well, to save yet another GB on Catalina. For the OS it doesn't make a difference as long as you put a symbolic link into the active /Applications folder. Only if you need to update the app via App Store, you may need to copy the full app into the Applications folder again. But this is very advanced stuff. So kids, don't try this at home on your dad's computer! ;)
I like to keep full installations on a backup drive, ultimately without the need of downloading stuff on the Internet just in case I don't have access or something. So which files/folders (in addition to the Logic app itself) would I then need to copy over to the backup drive?
The user settings are now mainly in ~/Music/Audio Music Apps
In theory you could be using the same shared settings for all partitions, again by applying some symlink "magic". But I haven't fully tested it yet beacuse there are also several databases and caches that might cause a Sound Library files mismatch.