I've already tried clearing the Play store data & cache, and also manually installed the latest version of the Play Store apk. If anyone has any other suggestions I'd really appreciate it.
Nexus 9 running Pure Nexus Project 5.1.1, if that matters.
I would like to add my case. I had the message unknown error -504. Tried all the above methods about clearing cache and data but nothing seems to fix it; in my case I had link2sd which seems to be involved or in the problem and the solution. To fix this I had to clear the dalvik cache with the link2sd menu tools, after doing that the apps install seems to work again. Note that this error let me download the app but it was failing at the moment of installing. Confirming final result = apps install without error.
According to a comment here, the error ID -504 is INSTALL_FAILED_UID_CHANGED. And this points to some mixed up permissions on the app's files.
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