WinMerge
2.15.2 is a so-called
alpha version, so last stable version is still listed to be version 2.14 from year 2013.
I am running version 2.15.2 ("alpha"), and it's just fine. No problems. However, the installation didn't overwrite the old version, so I am guessing version 2.14 was a 32-bit version (was working fine on my 64-bits), because I then uninstalled the 2.14 and still kept all of my new 2.15.2
>>>WinMerge is a Windows tool for visual difference display and merging, for both files and directories. It is highly useful for determining what has changed between file versions, and then merging those changes.
WinMerge has Unicode support, Flexible syntax coloring editor, Visual SourceSafe integration, and Windows Shell integration.
Regexp filtering for filenames and lines. Side-by-side line difference and highlights differences inside lines.
A file map shows the overall file differences in a location pane. The user interface is translated into several languages.<<<
Here are some notes about release and a plan for the stable version 2.16.0:
https://bitbucket.or.../winmerge/issues/84/-WinMerge
download from
https://sourceforge....-life-from-winmerge/homepage
http://winmerge.org/freeware, clean
Edited:
most recent version (2.15.4 at the moment) is at
https://bitbucket.or.../winmerge/downloads/ 
