Generally, Puppy has no automated update or upgrade feature. Similar as in Windows you check yourself for newer versions of your software. When you have a frugal installation you can upgrade some versions to their successors, such as Puppy 5.1 to 5.2. But e.g. 4.3 to 5.2 is a no go.

How do I update packages in Puppy Linux?

First, there are two ways to get the upgrade. The first is to download the full ISO of it. The second is to download the delta file and use the utility in Puppy to update the existing ISO to the new version. Use the xdelta with the lightning bolt to update using your existing ISO file.

Is Puppy Linux still supported?

Raspberry Pi OS is based on Debian, meaning that Puppy Linux still has Debian/Ubuntu support. This version of Puppy Linux is not compatible with personal computers, like desktops or laptops.
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Release versions.