Download meld from http://sourceforge.net/projects/meld-installer/
Unpack the downloaded zip archive into "Program Files" or wherever you want it to be installed. This will create two folders, named "meld" and "python".
Start "meld.exe" from the "meld" folder. If you get a Meld window opened, then you have installed Meld successfully.
In TortoiseSVN, select
Settings
, then go toExternal Programs -> Diff Viewer
on the left panel. InConfigure the program used for comparing different revisions of files
, browse to the Meld executable, "meld.exe", in your "meld" folder. Click on Apply.
That's it!