It seems that the README for included software has moved to another repo (virtual-environments), but the links are still pointing to azure-pipelines-image-generation repo
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Yup, all these links are now broken.

I've submitted a PR to fix the broken links. Please merge: https://github.com/MicrosoftDocs/vsts-docs/pull/6653
@farzadmf -- Farzad, thank you for your feedback.
@mithunshanbhag -- Mithun, I appreciate your creating a PR for these.
@steved0x -- Steve, please look into this issue & the corresponding PR.
Thank you for letting us know, I am tracking down the vs2015 link and will get it updated as soon as I find it, and I have approved your PR. Thank you!