That v1.5.01 is fairly old. You may be past the 1-year free update window. If you paid for updates, send an email to Support@LightburnSoftware.com and explain your issue.
1.5.01 had an issue with updates, your license key looks to be good to go for the latest and greatest version of LightBurn, so you can download that from here: Download / Trial – LightBurn Software