I just downloaded SenchaAnimator-1.3.0-00198.exe for Windows. When I try to run it I get a message saying "This installer requires administrator privileges". that's weird because I am an Administrator. I get the same message even if I choose "Run As->Administrator" when right clicking the file from explorer. I've never had problems installing anything before so I think there is a bug in this version of your installer program.
I was able to test it on both Win7 Home & Enterprise version and both installed just fine. When opening up the installer, the UAC asks "Do you want the following program to make changes to this computer" and I simply need to click yes.
Could you try downloading it through another browser?