Hello Stefan (D.), it's solved! Firstly, I searched program-wide for the *.dll, which weren't anywhere available. Then I load the new package one (despite it was defintely compiled later, it has the exact same product version number, in file properties; this only as a notice).. and yeah I find out: ...

Dear members, unfortunately I can't convert any HTML-Mail from Outlook 2007 (with latest ServicePack/Updates) with the OfficeAddin. There is an error message of missing the HtmlToPDF.dll . I've done a complete Reinstalling (X-Change V5 complete: PDF X-Change Editor v5, PDF-Tools v4, PDF Printer 2012...