I’ve been using Reaper daily for 15 years. If you run into any issues that you can’t figure out, feel free to reach out, I’m happy to answer questions.

Is it? I just installed the Accrescent app store, and don’t see it listed. It has 16 apps listed, including Accrescent itself.

It’s imperative I get it in their original unedited sound file form and in MP3 as .wav is too big and .ogg could crash certain programs like Vegas Pro.

I always hate it when somebody asks for help on a site like StackOverflow, and some smartass pipes up with “Why are you even trying that, why don’t you try ___ instead?”

I don’t want to be that guy. But I am very, very curious about why it is so imperative that you obtain the actual original audio files. Why would similar sounds not suffice?

For context, I am an audio editor / producer / sound designer / Foley artist, and I’ve run into that same problem, of old sound libraries not existing anymore, and have had to find, or create, my own alternatives. So I do know the struggle, but I don’t know your particular situation.