I'm installing Unity 4.0(3) with an off-box Exchange server. When I try to install Unity on the Unity server, I double click the language, click Next, then I get a "Setup can not upgrade from a version older than 3.0" error. This is a lab setup, but what did I do wrong on this one? I'm using the UnityInstall account to install it. the account was not a member of the Domain Admins group, so I put it there but still the same problem. It doesn't matter what account I use, I get the same error. Thanks for any help.
Thanks. That was it. I did not do a clean install of Windows. However, the Uninstall wouldn't run, kept giving me errors about version 2.x, but I did delete the folders/reg key you suggested and was able to install Unity. All is working now. Thanks.
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