What should I do if the error "Unable to start as AVEVA_LICENSING environment variable is unset" is displayed?

When running the AVEVA License System Console for the first time, the following error - Unable to start as AVEVA_LICENSING environment variable is unset is displayed:

This can happen on Windows servers. It is a Windows timing problem, the installer has set an environment variable but its value is not populated. As a result, various workarounds are available.

Wait for a few minutes and try again

or (reboot) the machine

or

Navigate to the environment variable, select 'AVEVA_LICENSING' > Click Edit then click OK to set it again.