The official VDR GIT archive is hosted at

https://git.tvdr.de

Use the command

git clone --branch stable/latest git://git.tvdr.de/vdr.git

to clone the archive and check out the latest stable version.

TAR archive

The source code for the latest version of VDR can be downloaded from

https://git.tvdr.de/?p=vdr.git;a=snapshot;h=stable/latest;sf=tbz2