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Yes. I've read all other questions regarding this problem. Like this one:
Error 504 when downloading apps from Play Store?
It's the same problem as this one but with more background information and an other app:
How to fix installation error -504?

The details:
My device is an Ulefone Be Touch 2 running Android 5.0.

My connection is perfect. To be sure I tried different networks, among them are 3G, 4G and wifi on ADSL, VDSL, cable and fiber. I've also used Tor and 3 different VPN providers in 3 countries on 2 continents. Let's say I ruled the network out.

  • A single app does not install: OpenKeychain.
  • Currently I have 126 apps installed.
  • It does not install via desktop browser > play store > install button.
  • I have enough free space (40GB). The app is 7MB.
  • Re-adding Google account and clearing caches did not work.
  • Even a complete device wipe and re-install didn't work.
  • Downloaded the apk and tried manual installation, same error.

I also own a Nexus 7 (2013 wifi) and the app installs fine on that device.

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Thijs
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  • put the device in airplane mode for ~60 seconds, then reboot, turn off airplane mode, download again. OR TRY 2) turn off data/wifi for ~90 seconds, then turn back on, download again. ///you can also sideload the app. ///If the choices (1 or 2) help let me know and I'll post as an answer. ///Did you force stop apps before clearing data??
    • – HasH_BrowN Sep 17 '15 at 03:15
  • The more I read about it and reread what you wrote, I'm thinking you have an issue with your ROM. – HasH_BrowN Sep 17 '15 at 03:17