How to choose where to install an app either to sd card or device? I have a samsung galaxy tab 4, i have already changed the download location to sd card, but i want to download an app and it says it can't be downloaded on the sd card, that it must be on the device. how can i revert it to download on the device, without taking the sd card out? Help its annoying to take out the otter box cover out, everytime.
You can  unmount the SD card from the settings. To do this: Go to Settings -> Storage -> Unmount SD card.

Removing the card  physically is not needed. 

You can later remount the SD card whenever you need it back by using the settings again, still without actually removing and inserting the SD card.