De la Mancha just made a small bugfix update to dirtbox 3, which fixes a bug that appeared in Sonar 7 and sometimes in Ableton Live. The bug would mean that no audio could be heard when the dirtifier was on, or in some ring mod modes.
If you already own dirtbox3 and you want to get the new version, just send de la Mancha an email using the same email address you used to pay, and/or a copy of the mail you originally got to download dirtbox3 (or bundle) and they will re-activate your download link for the new version.