Run the check
Each request is made relative to this installation folder, so the check works whether the package is installed at a domain root or inside a subfolder.
Ready. No hosting check has run.
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Installing the package
Extract the ZIP and upload its contents together — index.html, every laboratory folder, assets/ and data/. Uploading the archive itself, or a folder that contains the archive, will not work: the browser loads individual files.
You may install at the domain root or inside a subfolder. Open that folder's index.html to start. After replacing an older release, clear the hosting and CDN cache so the new versioned bundles are actually served.
If a laboratory does not open
Download the report and keep the exact failing laboratory URL. A 200 response that contains your host's own error page is still a failure, even though the status code looks correct — missing laboratory files have to be uploaded, and a rewrite rule pointing at the homepage cannot restore them.
Open the laboratory's explicit lab-name/index.html link from the homepage rather than relying on directory indexes. On Apache and LiteSpeed, the included .htaccess sets index.html as the directory index and declares JavaScript MIME types; the host must allow those directives, and other servers need equivalent configuration.
A successful file check verifies delivery only. To confirm that the interface and your device's graphics are working, open a laboratory and use its calculation status and playback controls.