Few Licences on same computer

[chrener]

Hi!
I have newest MES 5.0 installed on my computer with licence buyed in May/2022...
I install also MES 4.8 with older licence that is expired now...

Newest licence is not valid on mes 4.8 and 4.9, only works on 5.0...
If I enter valid licence (older) for 4.8 then it works, but it rewrite licence key also in MES 5.0 which is registered with my new licence.
So why I cant install both version of MES on same computer with different valid licences?
I need it for Proxi alignment procedure because MES5.0 cant correctly do alignment procedure...
I dont understand WHY???

They are inslatted in different directories with different names...

[shpuncik]

MES uses same registry key even for different installs. either use virtual machine for one version or you can try create new user and install other version onto it's account. can't promise that last method with different users will work.