Problems with version 10 Activate/Deactivate

We have a 7-user Pro license and recently one computer crashed. After getting new computer we installed emClient free version. When we clicked on deactivate it Crashed. Upon restart we are back to free version. We then went to a second computer which showed 7 users Pro license. We clicked on Deactivate and it also Crashed. It now show as also free version. We need to get this situation fixed.