How to fix Error 20 (The licensing service is not installed)

Tekla Structures - Not version-specific License library initialization failed with error error-20
Environment
Not environment-specific
Symptom 1
License library initialization failed with error:
The licensing service is not installed.
Symptom 2
Error 20: The licensing service is not installed.

Snapshots:
Image
Error_20-1.PNG

Image
Error_20-2.PNG


Solution:

The error appears when you starting Tekla Structures License Administration Tool or when you trying to run serveractutil.exe command line tool.
If you selected the Manual option for Tekla Structures licensing service installation then you need to manually install FLEXnet Licensing Service:
1. If you have some other FlexNet licensing service already running on the server, stop it before entering the commands.
2. Go to the Start menu and open Command Prompt as Administrator.
3. At the command prompt, type the following commands:
a. cd /D full_path_to_installation_directory
For example, if you install Tekla Structures License Server to default folder, you need to enter
cd /D C:\TeklaStructures\License\Server
b. installanchorservice.exe

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