Comment to UNA 10 Upgrade Help
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Your site is updated incrementally anyway. So if you have UNA v.9.0.1 and it says that 10.0.0-B2 available, then when you click on "Upgrade" then your site is upgraded to 10.0.0-B1 first, then you need to click to "Upgrade" second time after 2-3 minutes to upgrade to 10.0.0-B2.