The latest version of Texmaker can be downloaded from Softpedia
Texmaker, a Qt4 program that integrates many tools needed to develop documents with LaTeX, in just one application, is now at version 4.0.Texmaker 4.0 includes unicode support, spell checking, auto-completion, code folding and a built-in pdf viewer with synctex support and continuous view mode.
Highlights of Texmaker 4.0:
• The code has been ported to Qt5 (but this version can also be compiled with Qt4);
• Texmaker will be principally developed under QT5 and will be ready when KDEsc will switch to Qt5;
• A keyboard shortcut has been added to toggle between the master and the current document;
• A specific "quick build" command has been added for the .asy files. The asymptote figures can now be compiled and displayed with the F1 shortcut.
Check the official announcement for a complete list of changes.
Download Texmaker 4.0 right now from Softpedia.