Already installed:

When installing GNS3 or display:

How to get?
GNS3 need which c + +?

CodePudding user response:

Installing a KB2999226, use:
Expand - F: * E: \ Microsoftupdate \ Windows8.1 - KB2999226 - x64. Msu E: \ Microsoftupdate \
Dism. Exe/online/Add - Package/PackagePath: E: \ Microsoftupdate \ Windows8.1 - KB2999226 - x64. Cab