As I was preparing to start 2023 taxes I created a spreadsheet to track Federal and IL State "Tax History". I started with 2019 and there was an IL State 1040 entry on Line 16 for Property Tax credit from IL Schedule ICR. When I checked the "All Records" .pdf I saved in April 2023 for State of Illinois 1040 - Line 16 is BLANK. I opened TT 2022 and it indicated there are updates. I downloaded and processed the updates. I ran through IL State Taxes and Property Tax credit appears on IL 1040 Line 16 and the Schedule ICR is included. There were no warnings that you have already filed your IL State taxes on 04/15/2023 and that now the result is different. Nor did I receive an email from TurboTax alerting us to the error in TT State IL software. Our AGI does not exceed the $500K that would not allow the Property Tax credit. Now we need to process the IL 1040-X (Amended return) via snail mail. Are we eligible for refund of our TT purchase or cost of IL State download?
Probably not. The system most likely will tell you that since you got to file the amended return then you haven't been harmed, etc.
That being said it never hurts to ask. Here's where to request a refund. Good luck!