Descript automatically checks for new versions while it's running. When a new version is available you'll see an alert in the bottom right corner of the app. Click Restart to immediately start the update.
Manually Check for Updates
MacOS
You can select the Descript menu from the top left screen, then click Check for updates...
Windows
Select the Help menu, then click Check for Updates...
If you're up to date, you'll see a message saying saying "You're using the latest version of Descript" with the specific version you're running.