Not to belabor this but on the Restore Menu panel it says:
Upload and restore a site/space backup.
This site accepts full site imports from Confluence 4.0 and later, and space imports from Confluence 5.3 and later.
What does this mean?
Also, can I go directly from 5.8 to 6.1 or to I have to install intermediate releases?
Ann is right - upgrade it properly.
Although, there is another option - install an empty Confluence, export the spaces you want to transfer over one at a time and then import them one at a time - the xml space exports are mostly version-agnostic.
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