update Maos 10.13.6 to MAOS 10.15

Back up your data, check your applications for compatibility, click here, and if your Mac is a 2012 or newer model(2013 for a desktop Mac Pro), then on the download link for Catalina.

Catalina and newer won't run 32-bit software; download and use Go64 as well as using the first link above.

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To update from Mac OS 10.13 High Sierra to 10.15 Catalina you will have to click on the  icon in the top left corner> About This Mac>and, there will be a System Update button. Click that and it will let you update to the latest version of Mac OS that will run on your Mac.