Thank you, i'll try it and see.I used to have this problem, I have tried to solve it in the following ways, now I no longer get the "Network License Not Available" error, but can't determine how long it works.
1. Go to Task Manager, End Task all lines related to Autocad...
2. Use the firewall to block the file "aCad.exe" and 1 file "adskflex" as shown below.
3. Run the activation file again "AdskNLM.exe" and wait for the message panel to finish > Success.
Note: Do not turn off the firewall during use.