Trying to install Facebook app for Android many users encounter the following error:
Cant't install app "Facebook" can't be installed. Try again, and if the problem continues, get help troubleshooting. (Error code: -504)
Here you can find the solution that worked for us.
1. Go to Settings ? My device tab ? Language and input:
Tap Language and change the system language. We switched to German:
2. Go to Play Store and retry to install the Facebook app for Android.
We press INSTALLIEREN…
And in a few seconds the app is installed. We see ‘Installiert’:
Run the Facebook app and use it!
By the way, now you can switch back to your language. Most likely the Facebook app would work with English.