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Currently broken due to changes by torproject.org. You have to manually update Tor Browser in meanwhile:
https://www.whonix.org/wiki/Special:AWCforum/st/id262/updating_TOR_browser_error…html
Forum help thread:
[[Special:AWCforum/st/id262/updating_TOR_browser_error…html]]
Already fixed in git. Due to lack of a release manager and testers it will take some time until we can push an update.
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