There's a lot of software that used 20MB at the most in the XP days, but doesn't run on windows 10 or is missing some random new 2010+ era feature and just need

There's a lot of software that used 20MB at the most in the XP days, but doesn't run on windows 10 or is missing some random new 2010+ era feature and just needs a patch, but now the only modern version of this software is a minimum-viable-product SaaS monthly subscription.