I recently upgraded from 64 bit Linux Mint 18.3 to 20.1, via 19.0, 19.3 and 20.0, (in one day) unlike historic Windows upgrades rather than re-installs, that worked. The last 32 bit only version is 19.3 which seems also OK and is supported for a few more years. There is no penalty with 64 bit, some 64 bit Atoms have 32 bit Win10 because there is more of RAM & performance penalty with 64 bit win10, those Atoms run 64 bit Linux fine.
LO upgraded to 6.4.7.2 by the end of the OS upgrade procedure. I was using LO on XP till November 2016 on a 2002 Dell Laptop! I've imaged that using an MS utility and have it as VM on my current Lenovo running Linux.
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