The existing .pof for the '15 device will absolutely not work for the '20 device. You will need a recompile.
There is still a version of Quartus available that supports the EP2C20F484C7 device, QuartusII 13.0sp1.
I know it works because I use it all the time on that device on my development board. I use the Windows 10 Pro environment.
Get it here: https://www.intel.com/content/www/us/en/collections/products/fpga/software/downloads.html?s=Newest&f:guidetmD240C377263B4C70A4EA0E452D0182CA=%5BQuartus%C2%AE%20II%20Software%5D
The free web version works just fine for the CycloneII family.
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