Dropbox adding proplems

Yes I have rebooted the system. I have tried everything to get the apps back. And I am using the current firmwall. Even when rebooting  to store factory with out deleating data its still the newer firmware.

When it comes to installing 3rd party apps. It has to be a exe file. When I was trying to add the virse program it would not add from those tar files but when I found the link on her to a exe file it was able to do it. Even when updating plex. I dont know any SSH stuff.