Please follow each and every step very carefully so as to download and install WeChat for PC version. Its very simple tutorial, though you have to follow each and every steps.

Download Bluestacks / IntelAppUp on your computer.
Click ‘Continue’ and the process of installation will start.
Now, download the WeChat .APK file.
Double Click on that file to install WeChat for PC.
Now it’s ready to play.
Note : If you don’t want to download .APK file then you can simply search out for “WeChat” in the Bluestacks search bar, then double click on the app name and it will be installed into your PC.

http://www.byucm.org/wechat-for-pc-download-android-nokia-iphone/