Tag mismatch, R2021a, during installation
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The installer download fails with a "Tag mismatch!" error. It has happen on each download attemp. Failures occured at 20%, 7% and 6% of complete (100%) of download. I de-activated my Anti-Virus software after the first installation failure.
Pratheek Punchathody on 9 Apr 2021
This might be due to the connection issue. The workaround that we are proposing is to restart your machine. I have heard that this issue is known and the concerned parties may be investigating further.