After installing MC26 I'm getting the message "Warnung: Media Center wurde für ein anderes Betriebssystem installiert." (Warning: MC has been installed for a different operating system).
I have installed the correct 64 bit MC version on my Win 10 machine. Tried it many times: deinstalled everthing (MC25 too), restarted, reinstalled, tried it again as an admin - to no avail.
The only thing that helps, is using the compatibility mode for Win 8 under properties/compatibility. Problem and solution can be reproduced on my machine.
BTW: There is an old thread from February 15, 2011, 01:24:31 pm with that exact message from user Ver.di who upgraded from MC5 to MC16
He found a fix, but only for Win 7, not for Win 10 (Reply #14 on: February 17, 2011, 04:35:22 am):
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Fixed it:
For a normal install, the version of the OS is in the registry here:
HKLM\Software\JRiver\Media Core\Installations\Media Center 16
For Windows 7, you should see:
OS Version: 10
But the installer wrote 7.
I changed it with regedit to 10 and now it works fine"
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In my registry the value of OS Version is 1010.