FYI, the Brave Nightly downloaded OK on the Brave browser.
This article (https://www.technipages.com/chrome-download-failed-insufficient-permissions/) contains an image of what looks like an older and more specific version of the error message, which implies that the insufficient permissions relate to the local computer rather than the website.
The suggestions in the article include saving the file to a different directory and disabling extensions.
This page (https://stackoverflow.com/questions/46031982/google-chrome-has-insufficient-permissions-to-download-a-file-from-my-script) suggests it could be an anti-virus issue, or that changing permissions on the download folder could solve the problem.
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