You failed to read further down that page:
"Maintained for backward compatibility for Plugins"
The error you are getting is most likely from the plugin you are trying to install, not WP. The plugin needs to be updated.
I can install/uninstall any plugin on three different fresh installs of the latest version of WP. User levels are now deprecated.
The page clearly states:
Quote:
Administrator - Somebody who has access to all the administration features
...
the role of Administrator encompasses every possible task that can be performed within a WordPress blog.
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