The problem is not related to the license. Try the solution below and if the problem cannot be resolved, the customer needs to reinstall the Appeon Server.

Solution one:

The permission is not enough, please try to use the following solution to solve this issue:
a. Right click the C:\Inetpub\wwwroot folder, select the Properties items and select the Security tab page;
b. Add Everyone group if it is not listed in the box "Group or user names";
c. Grant Full Control permission to the everyone group.
d. Restart the IIS/Reboot the system.

Solution two (in case solution 1 does not work)

1.       Install the Appeon Server on a different machine

2.       Copy the following file C:\inetpub\wwwroot\appeon\AEM\db\t_pb_ini.dat from the new machine to the problematic server machine.

3.       Reboot system