As suggested by the other commenter, o-rings are the best cheap solution.

Another option that works if your keyboard has a hollow body is sound-dampening insulation inside the frame.

I have a Kinesis Advantage that has a ton of negative space inside and simply putting some non-conductive foam inside the shell made a huge difference in the amount of noise it makes

There are lots of reasons to pirate stuff, but this argument in particular boils down to “We should steal stuff now because maybe some day in the future I won’t be able to use the paid version after they go out of business.” And that is shitty.

You bought it, so go crack it now that the license check is broken and nobody will care. That’s GOOD piracy. Support the creators, pirate when you can’t or it’s unreasonable to pay (more).

Don’t just pirate to mitigate theoretical future inconvenience. Do it to circumvent actual inconvenience, or to get things you couldn’t otherwise afford, or to say “fuck you” to big, shitty companies.

But pirating from a small-time dev just in case there are maybe license problems far in the future is not The Way