Technician License difficulties

Hello,

We are currently running service desk version 5.5.0 (build: 5503), upgraded during last year from version 4.

We began with a 5 technician license and after good feedback we ordered a further 2 technician licenses. The extra 2 tech license was installed after the update to version 5.5.0

i went in yesterday to do some additional modification to the technicians but i cannot create any new techie's and if i remove techie rights from a user i cannot give them back (i get an error: only licensed for 2 technicians). It seems that the additional 2 technician license has overwritten the previous 5 techie license.

I need to return techie rights to a user account ASAP so what i am wanting to do is re-install the origional 5 techie license however the license was shipped with version 4.0. Will this still work?

After getting the origional license back in place how would i go about installing the 2 techie license so that we will then have 7 technicians? (the sales person assured us that we could do it).

Thanks in advance for your help.
Andrew, Divex.