Installation for Android devices uses a the Chrome Extension version of Closet Tools in Kiwi Browser.
You'll want to set the screen to stay on all the time to let Closet Tools run uninterrupted. If the screen turns off Closet Tools can't run in the background.
Depending on you tablet, you may have the option to set the screen timeout to "never" under Settings → Display → Sleep.
If you don't have this option, you can enable it by going to Settings → Developer options → Stay awake. This will keep your tablet awake while it is charging. This could be useful if your tablet does not support the "never" screen timeout.
Note: If you don't see Developer options in Settings, it may be made available by going to Settings → About → Build number. Developer options should appear after tapping the Build Number option several times.