If you want to move forward with the installation, let me know:
If you have GarageBand on your Apple ID (even on a different Mac), you can often download the compatible version directly from Apple. Open the App Store on your El Capitan Mac. Go to the "Purchases" tab (not the main "Featured" page). Find GarageBand in the list of your past downloads. Click "Install" or the cloud icon. garageband mac os x el capitan 10116 download extra verified
If you encounter an error, ensuring your Mac's security certificates are updated (by visiting websites like Let's Encrypt to update root certificates on El Capitan) will allow the legacy Apple servers to talk to your machine securely. Troubleshooting Common El Capitan Installation Issues If you want to move forward with the
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Find GarageBand in the list of your past downloads
How can I install Garageband on El Capitan - Apple Community