@Fahdoh follow my instructions:
Ok guys here is how I was able to finally download the app on my phone after being stuck many times on "Preflighting Application..."
First, try again to install the app with Cydia and once you get stuck on "Preflighting Application", do this: https://knowledge.globalplusplus.com/cydia-impactor/errors/preflightingapplication
if your error says something about "Your Device not being supported by the list of tencent.com ig...("
download 7zip and use this method:
my device was called Iphone 9.2 so so I have added <string>iPhone9,2</string> in the list
if you get a different error, try again to install through Cydia try again until it gives you an error stating that your device is not supported
P.S: People, please learn to read previous comments to find a fix related to issues. Thank you
@Mon-El were you able to make it work ?