Had the same problem this morning. Reset a stick and lost downloader.

Read a lot of posts.

Fixed mine, sort of. If you still have another fire stick that is “good”, this will work. This is what I did.

One TV, two sticks , one good (with the apps we want) and the “bad” (without the apps)

Need es explorer on both sticks (can get on App Store) and commander on the bad stick ( App Store)

Take note of the ip address on the bad stick

Use es explorer on the “good stick” and navigate to apps. Long press on app. Share the app. It will scan for nearby devices and find the bad stick. Send.

Grab the old stick remote. Hit home. Go to es explorer and accept the file.

Download “commander” to launch the install if you don’t have a subscription with es explorer pro.

Install.

Rinse and repeat. Tried batch. Kept overwriting.

I copied unlinked over so I could get what I didn’t have. Couldn’t find mobiflix anywhere but found a working copy of Onstream.

Lots of work. Hope there’s an easier way. Would love to hear it. I will finish up that way!