Andrij. I pronounce you Complete and Utter GIT
Kim, you are very bad!
If you can find the APK you can probably install it directly, but there's a risk that Dropbox's servers will refuse to talk to it.
What’s the malware risk with installing random APKs off the interwebs?
I used a similar tactic (I still don't know what an APK is despite having used it) to reinstall an older version of an app after updates had rendered it incompatible with my phone's venerable version of Android. But I couldn't find a way to stop it updating itself and ceasing to function again. So that might be something to look out for.