Guys, thanks for your help! If anyone faces the same problem, this is what I did to bypass the issue: after fully updating Win Server 2016, OMSA 9.5 can be installed, it seems that there's simply no way to install OMSA 8.5. 
  Hello, I can't install the Openmanage on a r210II with Windows Server 2016 on it. The error message is this: "The wizard was interrupted before Dell OpenManage Management Station could be completely installed. Your system has not been modified. To complete installation at another time, please run setup again." I understand this server shouldn't be running on Win Server 2016, and that's probably why this error is happening, as we have another r210II on Win Server 2012, and Openmanage was installed with no issue, but the former server has a system installed on it that can only run on win server 2016, so we have nowhere to go. We are in a desperate situation in which we have this server to attend thousands of customers daily and at the same time we don't even know if the hardware is ok or not. DSET, iDrac, all useless too. Any tips on how to solve this issue? Regards.    
Can't install openmanage on a r210II