Cannot install Facebook Messenger app A few days ago my Messenger app was crashing all the time - every time I tried to open it, it would say "Unfortunately, Messenger has stopped". In the end I uninstalled it, but now cannot reinstall it. It downloads and then claims to be installing for quite a long time, before my phone just turns itself off. 

I have tried deleting apps to make space, and clearing the cache, but nothing I've yet tried has worked. 

Also, I've just tried installing a random different app, and that worked fine.
Download an older version of the app from a reputable third-party source such as APKMirror or APKPure, preferably version 218.0.0.3.113 or earlier, and install it. 

You will need to enable "Unknown sources" when the installer would ask it when trying to install the app.