Have you ever gone to download a file from Google Drive, only to be prevented from doing so? Occasionally I'll make a change to my browser privacy settings, only to find it can no longer download the files I need. It's frustrating because I know it's going to happen when I make the change; I just forget how sensitive Google Drive is to such issues.
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What's the problem? Cookies.
How do you fix the problem? It's easy. I'll demonstrate on a Chromium-based browser, which is based on Chrome, because Chrome is the most widely-used browser on the planet.
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If you use a browser that is not based on Chrome, the basic idea will apply and you shouldn't have any problem translating the fix to your browser of choice.
How to fix the Google Drive download issue
What you need: In order to solve this issue, the only things you'll need are a valid Google account and a Chromium-based browser (such as Sidekick, Opera, Vivaldi, Arc, and Edge). That's it. Let's fix this problem.
Accessing Settings from within a Chromium-based browser.
You should block third-party cookies on your browser, even if it causes problems like this.
Adding an exception to the third-party cookie blocking policy.
If you find any other sites that are not behaving as expected (after you've set your browser to block third-party cookies), add an exception for that address and it should go back to functioning as normal.
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Although this can be a hassle, it's better to block third-party cookies and make exceptions as needed in order to better protect your privacy.