I used to use the following statement in my .NET program with no issue.
doc.Save(LetterName, SaveFormat.Doc, SaveType.OpenInWord, Response)
One fine morning, after installing your latest version 126.96.36.199, it started to give the error. "Name Savetype not declared". I did import Imports Aspose.Words at the top of my program and everything else like doc.MailMerge.Execute is working fine as it is.