At first glance at your question, I'd have to say no.
You'd need to download the files locally to update your codebase to upgrade (either directly or via NuGet, etc.) which I would then assume you use to update your production version (the version on the server I'm assuming?).
Unless you're doing some really funky stuff, I'm not sure how you can upgrade to the latest without downloading it in one form or another, to then deploy to your server.
Upgrade umbraco cms.
Is it possible to upgrade Umbraco cms v11.4.2 without downloading locally or upgrade the cms latest version directly on the server?
At first glance at your question, I'd have to say no.
You'd need to download the files locally to update your codebase to upgrade (either directly or via NuGet, etc.) which I would then assume you use to update your production version (the version on the server I'm assuming?).
Unless you're doing some really funky stuff, I'm not sure how you can upgrade to the latest without downloading it in one form or another, to then deploy to your server.
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