Hello @William de,
Welcome to Microsoft Q&A forum.
Package id should be necessary for identifying the NuGet packages, which means you might still need to list all the NuGet package ids, and then install them at once.
For example, in Visual Studio Package Manager Console(Tools=>NuGet Package Manager=>Package Manager Console), run the command like "Google.Cloud.Storage.V1", "Google.Cloud.lam.v1", "Google.LongRunning" | foreach {Install-Package $_}
.
I don’t find any method to custom to download and install all NuGet packages by “publisher1” at once.
Sincerely,
Tianyu
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