For your tweeters, try New England Speaker, 781 438-1786.No doubt. Although I’d imagine Adobe would have quite a list of products over the decades of existence now. As I said, if they actually wrote an update for your particular product, they should provide it. As a rule, we can all buy a piece of software or even hardware for that matter and once its outside of its warranty period, the company is really under no obligation to keep that product running in perpetuity.
Gibson just told me to throw my 1500 dollar KRK monitors in the river because I’m SOL for a new tweeter. They no longer support a monitor they sold 5 years ago. Cant fix it, cant sell me a replacement part and cant recommend a solution outside of buy a new pair. Yea it sucks, yea its shit service but they can sure do it.
Don't know if they still exist, but they're worth a try. I needed to repair my Tannoy monitors a while ago, and their physical shop was closed, but a tech met me in a parking lot for drop off and pickup, and they did good work, like they always have.