You can install a specific version of a package with apt-get in the terminal. First, determine the available versions you can install with the following command:
apt-cache showpkg <packagename>
e.g. apt-cache showpkg subversion-tools
would give something like:
> Package: subversion-tools
> Versions:
> 1.3.2-5~bpo1(/var/lib/dpkg/status)
> 1.1.4-2 (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_stable_main_binary-i386_Packages)
To install the specific version simply run run:
apt-get install <package name>=<version>
e.g. apt-get install subversion-tools=1.3.2-5~bpo1