When starting 12-Build, you get the error:

[NL]: De verbinding met de server is verbroken. Het maximum aantal gebruikers of vervalversie of vervaldatum is ontoereikend.
Solution 1 (permanent solution)
- Install (a newer version of) Codemeter.
Codemeter is the program for the license management. If you don’t have it or you’re working with a too old version, 12-Build will never find the license.
Use the WeTransfer link in this article to download the most recent version of Codemeter.
Solution (temporarily solution in case of Educational license)
- Close all BuildSoft software.
- Open CodeMeter Control Center using Start > All Programs > CodeMeter
.
- Select BuildSoft Edu 12 and click
. An internet page opens.

- Click on the menu License Monitoring and than on the 601 before BuildSoft Edu. You’ll that SYSTEM has claimed a license. Click on the Trash bin to remove it from the list.

- Now is should be possible to start ConCrete/ 12-Build/ Diamonds/… all at the same time.