PhotoQt is already available in the repositories of some distributions. I'd recommend to first check there.
Otherwise you can have a look whether your distribution is listed here. You either get a file to download, or instructions on how to get PhotoQt onto your system.
I'm trying to keep this list always up-to-date, but since there are so many different distributions out there, I can't catch them all. So if you know of any information that is missing here or any error in my list, please let me know!

Note, that after a new release it usually takes a little bit (usually only a couple days) before PhotoQt gets updated in the repositories, or before a new pre-packaged file is available. You can always compile the very latest version from source.

You can always find the latest development code in this GitLab repository.

Source FileArch - Link to AURChakra - Link to CCRFedora 21 & 22
Source File
Arch - Link to AUR
(Thanks to archtux)
Chakra - Link to CCR
(Thanks to UtG)
Fedora 21 & 22
(Thanks to zhonghuaren)
Gentoo LinuxMandriva LinuxLinux MintPCLinuxOS
Gentoo Linux
(Thanks to the Gentoo team)
Mandriva Linux
(Thanks to SymbianFlo)
Linux Mint PCLinuxOS
(Thanks to Archie Arevalo)
Rosa LinuxSlackware LinuxUbuntu LinuxWindows
Rosa Linux
(Thanks to SymbianFlo)
Slackware Linux
(Thanks to Matteo B. & Denis S.)
Ubuntu Linux Windows

Copyright (C) 2016
by Lukas Spies
latest version: 1.3