pqChecker is free & opensource software.It's licensed under the GNU GPL v3+.
There are binary installation packages for Debian/Ubuntu & RedHat/CentOS systems, to download from the download section of this website.
The source code of the latest stable release is also available in the download section. The history of the source code is available to anonymous download on Github website.
This is available for Debian/Ubuntu & Redhat/CentOS and compliants systems. The installation procedure is done through the dpkg or rpm utility. The detailed instructions for the installation are given in the README file which accompanies the binary files. Especially (the same for pqMessenger):
sudo rpm -iv pqcheckerxxxxxxx.rpm # Install pqChecker
sudo dpkg -r pqchecker
sudo rpm -ev pqchecker # Uninstall it
Security warning: Due to the sensitivity of the data accessed by these software modules, it is important to avoid installing binary packages with unknown origin.
Available for any POSIX compliant system. The tools of software's build must be installed on the target system: The C compiler, Make utility and the system C header files. The Java JDK 1.7+ is needed also. To build pqMessenger the Maven utility must be installed and you must have an active Internet connection.
Obtain the source archive of the target version, or get them from the Git source repository.
git checkout v2.0.0 # provides the sources of this stable version
The INSTALL file contains all the instructions to complete this operation. Especially for pqChecker:
sudo make install # allows pqChecker installation
sudo make uninstall # allows its uninstallation
And for pqMessenger:
sudo ./pqmessenger-install.sh # allows pqMessenger installation
sudo ./pqmessenger-install.sh --uninstall # allows pqMessenger uninstallation