If you're getting an error message that the Redgate Client Service won't start, a firewall rule may be preventing local use of HTTP. Please open an administrative command prompt and try the following commands:
This first command shows if any rules are defined.
>netsh http show iplisten
If there are no rules, then by default all services are on the AllowList. However, if the default is changed or if there is at least one rule then it may be necessary to add an extra one.
>netsh http add iplisten 127.0.0.1
Once added, please navigate to http://localhost:22221/redgate/status.html again to activate the license.
If this doesn't help, or if other non-RG services are affected then please raise a support ticket. The rule can be removed.
>netsh http delete iplisten 127.0.0.1