Draftsight 2015 Registration fails - error msg invalid link

Installed Draftsight 2015.  Each time I open it tells me I need to register.  Registration ends with error msg box titled AcSignCore16.dll out of date.  Error message says to see a post in the Community but the link provided is nothing but a placeholder.  Searching the community for AcSignCore16 (and various derivatives) returns nothing.  Draftsight opens after clicking OK in error msg but I'm getting tired of having to enter registration info every single time.