On the software download page at https://www.psi.ch/drs/software-download you find a link to all versions of the DRS software, which is located at: https://www.dropbox.com/sh/clqo7ekr0ysbrip/AACoWJzrQAbf3WiBJHG89bGGa?dl=0
Earch .tar.gz file has a date, which should help you find the correct version.
The new read_binary.cpp code
I will be very glad if anyone can help with the old version of read_binary.cpp code. The latest version I saw online was updated on June 30th, 2014, but I need the old version of the code to compare what changes were made in the latest version. This will help me to modify it and be able to read my data successfully. Thanks