i ran installer as administrator
i stopped service
Error running C:\Program Files\OttoFMS/bin/nssm/nssm.exe install “com.proofgeist.ottofms” “C:\Program Files\OttoFMS\bin\ottofms-win-x64.exe”
however it did install - iisreset - and site came back up
and shows " OttoFMS 4.11.0 © 2018-2025"