Generally, an updated version of SketchUp is released each year and we will communicate this via our website, email, etc. We recommend updating to the latest SketchUp version to get the best user experience.
The easiest way to update is via the In-App menu option, Help > Check for Update.
Alternatively, you can go directly to this Download All link to download and install it directly.
For tips on how to migrate your files and extensions, check out this article : Migrating after Updating
Note: we do include a few links to the Trimble SketchUp Help Center hosted by our US SketchUp partner as additional references. However, please note that any questions relating to your account and billings, you should always refer to our SketchUp Australia website and contact our team.