Floating License Server installer fails, but there is no FLS among installed programs so it can't be uninstalled.
If there is no the JetBrains License Service in the Programs list, it's very likely it was installed for another system user profile. Old versions had "per-user" type of installation. In this case, you need to find this profile, login and uninstall the application or to clean it up manually from Windows registry. Pay attention that it may be potentially harmful, and we recommend to have registry backup.