DAPLink is part of the latest KitProg3 package when you update KitProg to a version that includes DAPLink. See

Installing KitProg3

for information on where to get KitProg3.

If you wish to upgrade KitProg to a version that includes DAPLink, you need a tool called Firmware Loader. See

fw-loader tool documentation

for information how to use Firmware Loader tool.