I cannot re-install ezdrummer

I previously had ezdrummer on my PPC g5. I'm running 10.5.8.

It says "installer could not install some files in "/library/audio/plug-ins/components."

What happened was, I had it successfully installed before, but ironically, as soon as I got an authorization code, it magically wasn't letting me type that code in. So, I un-installed completely, and now i cannot re-install. I've seen tons of users asking questions similar to me, but none of them had the same problem, and everything i have tried will not work. I have a lot of music to work on so i really need this software to start working...and I am on about hour 10 of trying to figure it out.

Any and all help is appreciated.