WeChat is a Chinese multi-purpose messaging, social media and mobile payment app developed by Tencent.
To Install WeChat on AnduinOS, you can run:
wget https://dldir1v6.qq.com/weixin/Universal/Linux/WeChatLinux_x86_64.deb -O wechat.deb
sudo apt install ./wechat.deb -y
rm wechat.deb
Unable to automatically upgrade this application
The above command only installs the launcher. If you run sudo apt upgrade, it won't upgrade it automatically. You will need to manually rerun the above command to upgrade.
This is because the software provider didn't setup a repository for automatic updates. You will need to check the official website for updates.