Illustrator could only partially read this file - ... - Adobe Support Community - 10721486
Can't save the illustration ID: -54 - Adobe Support Community - 10146037
How to fix Error -54 (Can't save the illustration) - Can't save the illustration. The file may be read only, or the file is in use by another application, or you do
Solved: Can't save: "The file may be read-only, or another... - Adobe Support Community - 9804604
Preferences folder read-only error
Solved: Can't save: "The file may be read-only, or another... - Adobe Support Community - 8797519
Quick Tip: Solving “Read Only” External Drive Problems on Your Mac
Adobe Illustrator File Recovery - 4 Ways To Recover Unsaved AI Files
Solved: Can't save: "The file may be read-only, or another... - Adobe Support Community - 9804604
Adobe Illustrator CC 2019! How to Free Download, Install and Activate
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Solved: Can't Save Illustration: ID: -5000 - Adobe Support Community - 5897002
Illustrator Errors: Quick Tips to Solve Saving Errors
Solved: Illustrator could partially read this file - Adobe Support Community - 10962357
How to Edit PDFs in Adobe Illustrator
Cannot save - Adobe Support Community - 10178765
Can't save after edits in Acrobat 10. "File may be read-only or another user may have it open" (Edit PDF)
Illustratro CS6 suddenly won't open ai files - Adobe Support Community - 10871719
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Adobe Care on Twitter: "I hope the issue is resolved now. Give us a shout if you need anything else. 👍 ^Raj… "