Did you share the bot before releasing it? You can't download something from a dropbox link unless it is shared. I generally share it with myself and I haven't had any problems with Dropbox yet.
rumble client on all my machines from all over the world cannot download your bot as well, but manually run curl on the same machine is ok. I guess that’s dropbox restriction or some bug of rumble client.
If it's as simple as user vs. code, it may be that I made the link http rather than https in an attempt to mimic similar entries. Thanks for taking a look, but I'll re-submit after I've done ALL the homework next time. I'm still learning the build/deployment side of Java.