You could download it and click on it to install. Alternatively, a check is made for a Service Pack whenever the Puppy Package Manager is started, or a check may be made via the menu "Filesystem/Quirky Version Upgrade Manager".
What is new in 8.1.3 I have compiled the Linux kernel, now version 4.4.34. various small changes, including both 8192cu.ko and rtl8192cu.ko drivers -- this is for experimenting with wifi dongles that use that chip, and one of those drivers will have to be blacklisted.
We will experiment and get this wifi chip going!
Tex Dog in the Puppy Forum reported that the 'xrefresh' utility is missing, used by omxplayer. Fixed.