OMC connection problems after reinstall

[Breeblebox]

Hi,
I've recently reinstalled my laptop to Win11 and and installed the latest version of OMC. I keep getting a "login error - Wrong password".
My previous install was OMC R22.0_9.1a but I can't find the installer. An older pc with this version is still able to make a (LAN) connection.

So far I have tried versions OMC_40 OMC_52 and OMC_60, each resulting with the same error.
Tried different settings and combinations.
- switched off "Server authentication"
- enabled "Compatibility to older releases"
- disabled firewall

The login in newer versions is set to "Attendant Password". In OMC R22 there was an admin loginbox. I can't find a setting to change the attendant login to admin.

My target product is set to "Belgium Proximus Forum 700"
Does anyone have a downloadlink for OMC R22 or some tips to get a recent OMC version connected?