Download
The latest stable release of mtPaint can be downloaded HERE. Here is a more detailed description of these files:
Windows Version
mtpaint-?.??-w64-setup.exe
Installation program for 64-bit Windows systems (Windows 7 and later), including all of the translations and the handbook.
mtpaint-?.??-w32-setup.exe
Installation program for old 32-bit Windows systems (95/98/ME/XP), including all of the translations and the handbook. Should work on newer Windows versions too if you want a 32-bit program version there.
Linux Version
Due to the rich diversity of Linux systems, the best way to install mtPaint is to use a package that has been specially created for your system. The only packages here are TGZ packages for Slackware and Slackware64. They have the following filenames:
mtpaint-?.??-i386-1_slack14.2.tgz
mtpaint-?.??-x86_64-1_slack14.2.tgz
These packages require the following libraries to be installed: GTK+2.24, giflib, libpng, openjpeg2, libtiff, libjpeg, lcms2. They also install all of the translations, and the handbook. Packages for other systems exist at the following locations:
https://www.rpmfind.net/
https://aur.archlinux.org/
If a package is not available for your system, but you have a full GNU development environment, you can download the source code and compile the program:
mtpaint-?.??.tar.bz2 - Source file archive in tarball form.
mtpaint-?.??.zip - Source file archive in zip form (identical content to tar.bz2).
mtpaint_handbook-?.??.zip - The handbook.