Hi @jlalbrecht ,
Welcome to Microsoft Q&A!
For VS2019 Professional, you can evaluate a free trial for 30 days. Then, you can extend the trial period to 90 days by signing in accounts.
After a trial period ends, if you want to use Visual Studio with no internet access, you must use a produce key to unlock your Visual Studio to continuing using.
After you install the Visual Studio offline, the VS 2019 Professional can be used as a stand-alone unless the functions require internet.
Sincerely,
Anna
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