About SIM 7.5 and upgrades

Hello all, i have some questions about 7.5 and upgrades

1-) Does SIM 7.5 is compatible with Windows Server 2012 R2 Server core? I found this official documentation about system requeriments, and dont say nothing about 2012 server core ( http://h20566.www2.hpe.com/hpsc/doc/public/display?calledBy=Search_Result&docId=c04764057&docLocale=en_US)

2-) I need to upgrade my SIM version 6.3 to 7.5: what is best for me? upgrade 6.3 to 7.5 or unistall the 6.3 and install 7.5 ?

Thanks