Optimization not possible due to license problems


Dear all,
after having updated from HW 12.0 to 13.0, I now worked with Hypermesh for several months without any problems.
But trying to do some topology opimizations, I now always get the following error message:
License error:
Altair License Manager: License error
Feature: GlobalZoneEU
Error Code: 17
Error Description:
[LOCAL] E:\Software\HYPERWORKS\/security/altair_lic.dat - (Err: 6) Unable to read file
[NETWORK] 6200@tfprinter - (Err: 17) Request for more licenses than available on license server
Feature: OptiStruct
Error Code: 9
Error Description:
[LOCAL] E:\Software\HYPERWORKS\/security/altair_lic.dat - (Err: 6) Unable to read file
[NETWORK] 6200@tfprinter - (Err: 9) Feature not found
License Path: 6200@tfprinter;E:\Software\HYPERWORKS\/security/altair_lic.dat
License Type A came with 50 pieces of Altair HW Units.
Is an entire reinstallation of HW 13.0 necessary or is there another solution possible?
Thx for your help.