Logic express 8.o.o isn't working properly on Mac ox 10 Yosemite.

I'm not a mac user nor familar with Logic (a common accusation, hah). But knowing Pro Tools X won't work with Windows version X I'd start with compatibility and see if Logic Express is supported by 10 Yosemite (the operating system I presume). Then I'd check into updated drivers. Probably best to look for any Logic forums dedicated to the program.

Good luck!

I have Logic Pro 9 and 10. When Apple changes OP Systems and stop having the App Store support, the only thing you can do is transfer your old songs to the newer version. The older version is now obsolete and quits working. If you have a copy of your old operating system, then you would have to reload that and it may work with your older version of Logic. There will be no updates but you would be able to run the software again.
Apple is very proprietary software and is really stingy with allowing any other programs to run on newer versions of their software.
So, you take the chance that it might work with the last version of the operating system known to be able to run your recording program, but that's my best understanding of how Apple works.
My Logic Pro 9 was dead in the water when Apple upgraded to a newer version and could only transfer my recorded songs into Logic Pro 10. I really liked how Logic 9 worked and have yet to get into version 10, but now own a newer computer and it will run version 10, quite well. I maxed out the ram and have all new solid state drives. It is running Monterey and this version is very stingy and won't share a lot of the older versions of most programs! But with my new Thunderbolt hub, I can hookup a lot of perreffrial equipment and not over tax my OP system. I found a Thunderbolt 3 hub that is backward compatible to Thunderbolt 2 stuff and gives me a lot of flexibility to run my outboard gear, plus it supplies the current to USB gear and further enhances the ability to add additional equipment without taxing the OP system, plus the addition of HDMI monitors! Way cool!
I went to Macworld (Other World Computing) and bought a used MacBook Pro and had it upgraded to the max, to be able to serve my future needs. I saved a bundle doing this and it might be a good place for you to check out some of their options.
Sorry but that's my best info for you.

Thank you Auf, Cal and G. Being financially challenged, upgrades are out of the question. God bless.
s:0)

I was a MAC/Logic guy for a long time but wow have they gone from being trouble free to being POS's in recent years. Besides the constant OS changes with no backwards compatibility, lack of software choices and just overall raping of the customers pricewise, I converted back to PC a couple years ago. For the price of an entry-level MAC I got a really boss PC that can do video all day as well as meet all my recording needs.