We also encourage to see the video tutorial: Activating CADprofi license
Maintenance is not being automatically renewed. Immediately before the expiration date, the
maintenance may be renewed for a fee, however, after expiration, it cannot be resumed. The cost of renewing the
maintenance for 12 months is 25% of the current program value.
Expiration of maintenance will not disable the program. The lifetime commercial versions of the program continue to operate, but without the option of downloading free updates. Program can be updated at any time, the cost of a one-time update is 50% of the current program value. If you purchase an upgrade, you will receive a maintenance renewal for one year from the date of purchase (with the option to purchase maintenance for additional years).
Возможные причины:
In order to activate a commercial version of CADprofi application you need to perform the process of activating the license. Detailed information about registering and activating the license can be found in this video: Activating CADprofi license
CADprofi company hasn't got any influence on further development of other
producers tools. That is why, it is not guaranteed that these tools will
function in every hardware and system configuration in particular when user
installs an update (ServicePack or Hotfix) to AutoCAD LT® program. These
programs are not covered with CADprofi maintenance and we don’t provide support
regarding the working of our applications with AutoCAD LT®.