Zipfiles will not open to install

HELP…. Idk how… But my Kodi disappeared off my firestick the other night. All the apps with it. I tried to download a new version. Now… When I go into my KODI, and I try to install from zip file… Literally… Nothing happens. I remain on that screen. I see all my old zip files there too. Nothing works… And I have no idea what to do to get my Kodi back to normal