A network error when trying to download TurboTax from a vendor link means an issue with your own network between you and where the file you are trying to download is being hosted. Most network errors on files are retry-able, please see if you have the resume/retry button on the download.
You should contact Sam's Club about the link you received. If you can't resolve this, here's how to Contact TurboTax Support. They can push you a download link from Intuit.
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