#1. I meant about officially supported OS |2k8r2 Sp1| but not about Web, DataCenter.
#2. Seems like You can open properties of msi, then try to tick the “Run this program in Compatibility mode for” checkbox, and select the appropriate OS -> try to install it.
But do not forget that if there will be issues, etc, then first root cause will be because of unsupported OS usage for released build, which officially supports only Windows 2008 R2 SP1 x64 Server OS within 7.5.x/7.5 SP1.x releases.
Thanks,
IP.