I have a license for www, and a test subdomain that we use for development. In that test site, in the WPSolr settings there is a note that “This is a test environment only.” However, looking at the plugins list, updates are not available. I see this message:
There is a new version of WPSOLR PRO available. View version 22.0 details. Automatic update is unavailable for this plugin. License xxxxxxxxxxxxxx is not activated for site https://test.xxxxx.com/wp-admin/. To receive automatic updates license activation is required. Please register or buy extensions to activate your WPSOLR PRO.