Hello there, khans-im.
It sounds like you're unable to download the Logic Pro X application onto your Mac running Mac OS X Yosemite. The following article includes some great instruction on how to reinstall Logic Pro X:
Logic Pro X: Troubleshooting basics
Another approach you might consider is reinstalling Logic Pro X. To do this effectively, you need to remove the application, then reinstall it. You don't have to remove everything that was installed with Logic Pro X.
To reinstall Logic Pro X, do the following:
- In the Finder, choose Applications from the Go menu.
- Locate the Logic Pro X application and drag it to the trash.
- Open the Mac App Store
- Click the Purchases button in the Mac App Store toolbar.
- Sign in to the Mac App Store using the Apple ID you first used to purchase Logic Pro X.
- Look for Logic Pro X in the list of purchased applications in the App Store. If you don't see Logic Pro X in the list, make sure it's not hidden. See Mac App Store: Hiding and unhiding purchases for more information.
- Click Install to download and install Logic Pro X.
For further information on settings or installation refer to the Logic Pro X User Guide.
For issues installing the additional content, see Logic Pro X, MainStage 3: Issues installing additional content.
Thanks for reaching out to Apple Support Communities.
Kind Regards.
