Cannot activate license v18update15

[farhanrkhan]

Hi Support,
I am trying to update the License but it is givig error 3CX failed to establish a TCP connection to activate.3cx.com. although i can ping to activate.3cx.com, please advise how i could manully update the license on the system, it is expiring today.

 

[Evolute IT]

You cannot activate anymore because you didn't keep your system up-to-date and the activation servers changed in the meantime.

You will have to backup, reinstall and restore.

 

[TheodorosG_3CX]

The PBX requires to be at least under V18.0 Update 8 (Build 939) in order to activate.
The safest way it to create a full backup and restore using the latest V18 ISO or Windows installer.
Keep in mind that this will be required otherwise you will not be able to move to V20 since this version cannot be restored in V20.