With the fast pace world of technology as well as yearly releases, keeping everything running smoothly and securely becomes a larger and larger task. This is why SketchUp introduced their end of support policy.

All this means is that SketchUp and Trimble will no longer update or fix issues found in those unsupported versions. 

As it stands, on January 31st of every year the next version will become unsupported with 2025 removing support for 2022 (so 3 year old versions become unsupported). 

This means along with no technical support they will start pulling access to certain features like 3D warehouse and Add Location, so if this is something you rely on, please consider updating to the latest version or at least one version up from where you are before 31st of January each year.

For the official statement please see this page: https://help.sketchup.com/en/admin/end-of-support-policy