Until version 1.2.49 the "FTP Database Download" did not work and some DLLs where missing.
To work around the download problem you can download the database with any other FTP-capable tool and open the file with "File --> Open...". The "FTP Database Upload" always worked!
wget ftp://root:relook@ip-of-your-box/var/data/db.dat -O ~/Desktop/db400.dat
The missing DLLs have to be placed in your applications directory or to ~/.wine/drive_c/windows/system32/:
mfc42u.dll (only for PCEditorU.exe)
Since 1.2.46 Beta 7 the Non-Unicode version has been removed and the mfc42u.dll is always needed!