No, Dropbox is still supported, and thank you for the positive feedback! Our engineering team is working to add tens of thousands of new parts yet this year!
As for your current issue. we did move the configuration files to better support the new direct download capability which many users have to use. To troubleshoot your issue.
Using file explorer, enter %appdata%
then go to the PartQuest Tools subdirectory. Here you should find a file, Pq.ini which has a key TargetDirectory= This should point to PartQuest directory in your dropbox. For example:
TargetDirectory= D:\Users\glameris\Dropbox\Apps\PartQuest
Then in your wdir directory, usually C:\Pads Projects\ there is a PartQuest folder that contains PartQuest.ini. The Dropbox folder key should point to the above folder, but also add the flow, in your case PADS_Netlist as shown below.
DropboxFolder=D:\Users\glameris\Dropbox\Apps\PartQuest\PADS_Netlist
Then try to download a part. If your still not successful, send me an email at gary_lameris@mentor.com.