Once you have received your license file (license.properties) you need to upload it directly via SynAdmin.
Open the administration page SynAdmin http://<myserver>/<WebOffice application>/synadmin and navigate to the "License" tab.
Press the Browse button an select the received license file (license.properties). Then, finish licensing by pressing the Import License button.

Import license via SynAdmin
After importing the license SynAdmin will ask you to reload the application. Submit by pressing the OK button and log-in again.

Approve reloading application after license import
Now check in the "License" tab if the license is installed correctly: In the "Licensed" and "Expiration date" columns you can control the availability of the installed license.

Verifying successful license installation