Can I install a version of Logic Pro that would be compatible with: iMac (21.5", Mid 2011), 2.8GHz Intel Core. I couldn't run the free trial 7, 32 GB Memory, 1 TB SSD, High Sierra 10.13.6

Logic Pro Technical Specifications

Minimum System Requirements

• macOS 10.15.7 or later
• 6GB of available storage space for minimum installation or 72GB of storage space for full Sound Library installation

But if you can find someone selling an old version of Logic Pro X...

https://roaringapps.com/app/logic-pro-x

Yes, great news I could help, take care my friend! :)