When you need specific version of package, you can install the version you want using apt.

list of version

$ sudo apt-cache policy <package-name>

install specific version

$ sudo apt install <package-name>=<version-you-want>

ex)
show all version list of librealsense2

$ sudo apt-cache policy librealsense2
    
librealsense2:
  Installed: 2.11.1-0~realsense0.70
  Candidate: 2.14.0-0~realsense0.74
  Version table:
    2.14.0-0~realsense0.74 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages
    2.12.0-0~realsense0.73 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages
*** 2.11.1-0~realsense0.70 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages
      100 /var/lib/dpkg/status
    2.11.0-0~realsense0.69 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages
    2.10.4-0~realsense0.67 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages
    2.10.3-0~realsense0.66 500
      500 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo xenial/main amd64 Packages

install specific version of librealsense2

$ sudo apt install librealsense2=2.11.1-0~realsense0.70