I'm interested in this question as well. It's well studied, and there's lots to learn about it on this forum and others. I don't have the rep to see the solutions present but basically it looks a bit like this:
-- Modern FlexLM uses ECC [elliptic curve cryptography, aka asymmetric crypto]. The implementation isn't quite right, so you have to use their SDK to create a genuine file. Youo can get the sdk by registering for a trial on their site
-- THe magic are the private keys compiled into each application and eaaach version of the lmgrid
-- You can either try to find them -- v. hard -- or paptch ouot the calls to it
-- Therrefore while this reciep works it is not a panacea; you need skill / practice for it and there is no single 'app' that works. but there are those that give you hints
-- Bruteforcing the private keys is theoretically possible but not very probable.
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