Anyways, I've attached the APKs here, and you have to install all of them (with the same signature, from me) to make the app work because of APK signature issues, otherwise after installing the main Gear app, the other needed plugins, and service apps will fail to install (I still don't know how Samsung managed to do that).
I've included the plugin APKs for Gear S series, Gear Fit2, Gear IconX, and Gear IconX 2018, please download the corresponding ones for your devices.
If you failed to install any of these APKs, make sure you uninstall all the other Samsung related apps first, as some of them seem to be able to block these installs somehow.
PS: Samsung Pay is not working with the recompiled APKs at the moment, probably because of the different signatures on the APKs, any ideas on how to fix this?
PPS: I've also included my keystore file (my.keystore). In case you have other Gear devices, just go to APK Mirror or whatever you prefer and download the corresponding plugin APK, resign them with this keystore file and install it with the Gear App, then it should work (resign APK simple tutorial, detailed tutorial, remember to replace the keystore's name and password with the corresponding ones. Password for the keystore file when resigning: 314151)