TubeBuddy is always updating in order to push out new features or bug fixes. So it's important to check your TB version in order to know whether you're on the latest version or not!
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How to Find the TB Version on the Browser Extension
In order to find the TB version, head on over to YouTube.com and click on the TB icon next to the upload button (1). It'll show the drop-down menu and at the bottom right corner, you'll see the version number (2).
How to Find the TB Version on the Mobile App
On the mobile app, you can find the TB version number by clicking on the menu button on the bottom right (1). It'll pull up the menu and at the bottom left, you'll see the version (2).