- I always take the time to register my purchases, so the company has a record of my patronage over the years
- I always save the emails that confirm my registration/activation keys.
Sony (Sound Forge, Acid, CD Architect): Had all my registrations online, with serial numbers and everything. I was able to download updated versions with no problem. If there was any trouble getting a new activation key, there was a live chat mode to get this from a customer service representative. A+!
Propellerhead Reason and Ableton Live: I had "lite" or "adapated" editions of these programs that came bundled with the Pro Tools Factory Edition. Now that I've upgraded to Pro Tools 7.4, it turns out these bundled versions use incompatible Rewire modules. Ableton Live has a generous upgrade policy, but the program still crashes Pro Tools. Reason, on the other hand, offers no upgrade path whatsoever...which sucks that a bundle I paid for is useless after buying an upgrade to the host software. :(
Arturia Moog Modular and CS-80V Softsynths: Worked like a dream. Entered my old serial number from my earlier email registrations, and I was able to download the latest and greatest version. A+!
Native Instruments B4 and PMI Bosendorfer 290 plug-ins: After downloading a new authorization wizard, it connected to the website, found my old registrations, and allowed me to register my software. (Fortunately, I had the CDs for these.) A+.
I also had good luck with VirSyn Tera 2.0 softsynth, Emagic Sound Diver 3.0 (although it keeps randomly asking for the original CD to verify the authorization), IK Media (Amplitube, T-Rracks) and Coda (Finale notation software).
I was less happy with Waves (the Gold native bundle won't even install on a 64-bit platform), FXpansion (my copy of VST-RTAS wrapper isn't compatible with the new PT 7.4), Steinberg's Free Filter plug-in (way cool software, but it registers my 120 GB hard drive has having negative free space, and therefore won't install), plus a few others (including Steinberg Clean! and BIAS Soundsoap, noise reduction programs both). At least I can upgrade the Waves bundle and the VST-RTAS wrapper to compatible versions.
The moral of the story: Always register your software, because you never know when you'll need it.

