Hi, found the best way to realize this now.
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Install Adobe Reader German
(Check If MSI ac76ba86-7ad7-1031-7b44-ab0000000001 [German] is installed; Installable if ...ffff...[MUI] is installed AND ..7ad7.. is NOT installed) -
Uninstall Adobe Reader MUI
(Check if MSI ac76ba86-ffff-1031-7b44-ab0000000001 [MUI] is installed; Installable if German & MUI are installed)
Uninstalling by userdefined Update with Uninstall MSI "ac76ba86-ffff-1031-7b44-ab0000000001" -
Update by MSP-File.