Upgrade sep 12.1.5 to SEP.cloud

Hello,

I want to migrate to SEP.cloud, clients are ok.

but I´ve got a problem on my Server (Server 2008 R2, Exchange, Mail Security for Exchange 7.5).

On the Server I´ll get the error on the install of SEP.Cloud agent : "reboot pending".

Manually uninstalled the 12.1 agent, rebootet the server, but still the same mesage!

What could I do?

Thanks in advance