Where to find Cyclone 10 LP device files for Quartus Prime Pro?

@BillBatty, please see:

https://community.intel.com/t5/Programmable-Devices/A-Tale-of-Two-Cyclones/m-p/1492497

What version of Quartus exactly did you use to create the original project, and what device exactly did it target? To my knowledge, no version of Quartus Pro ever supported the Cyclone 10 LP family, so there's some confusion here about the starting point.

I suggest that you examine the original .qpf and .qsf files to answer the questions above.

Yeah, Cyclone 10 LP is only supported in Standard. It sounds like you opened the project in Pro and it somehow successfully converted it into a Pro project. Once a project is Pro, it cannot be opened in Standard or converted back to work in Standard. I'm just not sure how you were able to open it in Pro since the device is not supported there.

Hello,

Cyclone 10 LP is only supported in Quartus Prime Standard and Lite edition: https://www.intel.com/content/dam/www/central-libraries/us/en/documents/quartus-prime-compare-editions-guide.pdf

Regards,

Nurina