I see he same issue as @Technowix was just going to report. Plugins that are upgradable for me seem to want to downgrade to previous version.
broken plugin
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Please be careful and take extra caution while installing this plugin nodebb-plugin-sso-auth0. It seems plugin is broken
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The developer appears to be active. You should open a new issue on their github if you are having problems.
https://github.com/Antergos/nodebb-plugin-sso-auth0/issues