Hi @Great Scott ,
Welcome to Microsoft Q&A!
Please check the system requirements of VS2019 and upgrade your agent to the latest version.
And use the –fix parameter to fix the missing package files. It requires an internet connection.
Then, move the complete layout to the machine without internet and retry the installation.
Besides, MSBuild is included by the Desktop development with C++ workload. You can try to add Desktop development with C++ workload to install it
vs_Enterprise.exe --layout c:\VSLayout --add Microsoft.VisualStudio.Workload.NativeDesktop --includeOptional --lang en-US
Sincerely,
Anna
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