The binary packages can be downloaded at this link while for the source files, the use of svn is reccomended. If you have a svn client installed on your computer, then you can download the latest version of Mimotera++ source files pointing to the repository:
svn co https://mimotera.svn.sourceforge.net/svnroot/mimotera/trunk mimotera
The svn repository can be browsed clicking this link.
Now you can proceed with the Installation