How to update the built-in Microsoft task library in TFS 2017?
问题 What is the process for upgrading the default tasks loaded by Microsoft in an on-premises TFS with no internet connectivity? According to https://docs.microsoft.com/en-us/vsts/build-release/tasks/ there are several tasks now available and supported in TFS v2015-2018/VSTS that do not appear in my TFS 2017u2 installation (specifically the Download Secure File task). The default tasks are not shown in the Manage Extension screens and the git repo (https://github.com/Microsoft/vsts-tasks) does