There seems to be a loophole where if you have already sideloaded a version originally downloaded form the Play Store (i.e. if you extracted the apk from a roo

There seems to be a loophole where if you have already sideloaded a version originally downloaded form the Play Store (i.e. if you extracted the apk from a rooted HSPA+ Nexus device), then you can get updates. If you've not installed it, then the store won't let you have it.