Two downloads are available here as follows. 1. ESP-r_V?.?.?.deb.zip is a precompiled installation for Ubuntu 22.04. Install using: 'sudo apt install ESP-r_V?.?.?.deb' (you may need to log out and in again). Uninstall using: 'sudo dpkg -r ESP-r'. 2. ESP-r_V?.?.?_Src.tar.gz contains the source files of the latest released version of the ESP-r system to support changes and compilation for any machine architecture. Please unpack and consult the Readme file in the top directory. Good luck! P.S. Please ensure that your Ubuntu environment is suitably configured to work with ESP-r by following the instructions available at https://www.strath.ac.uk/research/energysystemsresearchunit/applications/esp-r/. P.P.S. You may wish to install the following third party programs that can be used by ESP-r. gtool - for 3D geometry definition: Ubuntu 64-bit https://www.dropbox.com/s/nrci1t9dievypw4/esp-r-cad-patch-x86_64-built-021218.bin?dl=0 Ubuntu 32-bit https://www.dropbox.com/s/w6lc9ys2jmc4kv3/esp-r-cad-patch-i686-built-301118.bin?dl=0 Uninstaller https://www.dropbox.com/s/q3d8vlhv94bajpx/esp-r-cad-patch-uninstall-301118.bin?dl=0 See also the file gtool_install.pdf available from https://www.strath.ac.uk/research/energysystemsresearchunit/applications/esp-r/gtool_install.pdf Radiance - for lighting simulation: https://www.radiance-online.org/