Retrospect 2.x is not compatible with System 7.5.3 and later. You should contact Dantz Development Corp. for information on how to upgrade to Retrospect 3.0 or later.
The Tech Info Library article titled "Locating Vendor Information" can help you search for a particular vendor's address and phone number.
Article Change History:
11 Feb 1997 - Changed article completely, new information.
18 Oct 1996 - Updated the URL.