If you need to re-authorize a plug-in, send mail to AUTHORIZE@SISYPHUS.COM
Please don't use the fax or phone numbers. Both will be disconnected soon.
For anything else, send an email to INFO@SISYPHUS.COM . We will support all upgrades as far as MAX r5 and as far as trueSpace V6 free of charge to registered customers.
The email addresses and the domain will stay working as long as there's any chance we have something out there being useful. Years, at least. Promise. Really.
DNT will become the property of Arete shortly. They will likely continue to develop and upgrade it.