Adobe Dreamweaver CC 2014 v.13 User Manual

Page 692

If you choose not to use Extension Manager (by clicking No in the prompt), Dreamweaver downloads the extension (.zxp) in your Documents
folder.

Note: The extensions are downloaded in your Documents folder if installation of extensions fail for any reason too.

Extension Manager supports only .zxp formats and only extensions with valid signatures can be installed using Extension Manager.