Click on Download W3GPathCorrector.exe. Save the file to a directory complying with your desire.
Be aware that W3GPathCorrector.exe must not be moved after installation, so make sure that the current path is satisfying.
NOTE: When you have to move it later on it's no big deal though, just run the installation again.
Rightclick W3GPathCorrector.exe and choose Run as administrator. Administrator rights are necessary to connect Warcraft III Replays with this software. Details here. If a "Couldn't synchronize" error occures go here.
Click Yes to install the program.
Now there should pop up a message about a successful installation.
If not, make sure that you followed all the steps of this guide. Does this not solve the problem, feel free to contact me :)
NOTE: Don't delete W3GPathCorrector.exe after installation! It's setup and installed software at once, you will still need it.
From now on watch replays via opening the w3g-files. If you open them manually in Warcraft III with aid of the View replays function this software gets bypassed and has no effect!
NOTE: Openening w3g-files means double clicking them or rightlick->open