I just got Altiverb, and it did not come with a Windows installer.
You need to register in order to download the latest Altiverb installers (both mac and windows), please go to:
http://www.audioease.com/av5auth/
and fill in your e-mail address (the one you’d like to register for Altiverb). After this, you’ll get to a registration page; fill it in and hit proceed. After this you can access the download at:
http://www.audioease.com/Pages/Altiverb/AltiverbDownload.html
Fill in your email address right below where it says: UPDATES. Then hit the button and download the right installer.
Altiverb also needs acoustic samples, you can pick up individual sets from:
http://www.audioease.com/IR/
There is also one big (800 MB) download (including both Mac and Windows installer) at:
http://www.audioease.com/cgi-bin/red.cgi?ir563443536628
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