https://www.dotnetzone.gr:443/cs/blogs/birbilis/archive/2015/10/10/fix-vsix-installer-error-signaturedescription-could-not-be-created.aspxThis is my answer at: http://stackoverflow.com/questions/31552082/vsix-installer-signaturedescription-could-not-be-created-for-the-signature-algo/ to the question on why some extensions fail to install at RC (Release Candidate) versions of Visual StudioelCommunityServer 2.1 SP3 (Build: 20423.1)