Looking for a quick source download? Krusader comes in different flavors:
The latest stable version of Krusader.
Mature, and safe for everyday use. Made for KDE5 / KFramework 5
This version is a (possibly) unstable and older build of Krusader. Usable with KDE 4.
Supplied for older systems.
Chances are good, that Krusader is already part of your distribution and can be installed without major effort. In a perfect world Krusader is only one command away ...
# apt-get install krusader
# emerge krusader
Note: Refer to the official Gentoo Handbook if you intend to try the testing branch.
Related links: Packages.gentoo.org
# dnf install krusader
Related links: Fedora package database
# urpmi krusader
Related links: Mageia wiki
More systems known to include Krusader:
Arch Linux, ArcheOS, Ark Linux, FreeBSD, Frugalware Linux, Kanotix, Lunar Linux, ROCK Linux, OpenLX, openSUSE, Knoppix, Linspire, PCLinuxOS, ALT Linux, Source Mage