You cannot use Mathcad Prime 7.0 using Mathcad Prime 6.0's license file. You need to have Mathcad Prime 7.0 license for using version 7.0.
Note that licenses are downward compatible for Mathcad hence, any higher version license would be applicable for below versions of Mathcad.
Can not reactivate Mathcad 11 :
Auto Repair Can't reach activation server. Is there still such a server?
Manual Repair. PTC (Mathcad) will not give me the 20 character Activation Key unless I can get a work around from the user community. Please post if possible.
The Activation server was closed down somewhere in 2015 or so. PTC has anounced to discontinue actively supporting any version of Mathcad (not Prime) at the end of this year.
Assuming you're using a single user license (protected with Cdilla), you only stand a chance on successfull installation if the harddisk you are installing Mathcad on still contains the Cdilla files in the correct place and in order, so that the activation server isn't needed. Apparently that's not the case... Another Mathcad 11 installation lost 😞.