Do not download the "Source Code" files.
This is a "dummy" release just used for providing PDF versions of the manuals so you do not need to run LaTex to make them "from the sources".
Manuas for the "release" versions as well as a manual for the "current" version are deposited here. The "release" version manuals are not expected to be changed, but the manual for the "current" version is regularly updated.
Release version manuals are named piHPSDR-Manual-vX.Y.pdf for Release X.Y.
The "current" manual (referring to the master branch) is simply named piHPSDR-Manual.pdf.