The download module is the same as in Usenetic, so there shouldn't be any differences.
For that reason I've changed the title of this discussion.
The upload module is new and tested and seems to work fine.
But if you experience otherwise then please send me more information by doing the following steps:
1) Enable the socket debugger (Preferences->Download->Advanced)
2) Upload a file (don't download during the upload)
3) If the upload failed, send me the log file (File->Open Log File) to firstname.lastname@example.org, including the name of the file you uploaded and the newsgroup you posted to.