Thanks for the link to your StackExchange post, which gives this recipe:

Inside a text cell start an inline cell: Insert > Typesetting > Start Inline Cell, enter hyperlink:

Hyperlink["Example Domain", "http://example.com"]

select entered hyperlink and evaluate: Evaluation > Evaluate in Place.

Your method has the advantages of simplicity and dynamic mouseover color change, the method I propose is a bit more complicated and lacks the mouseover, but has the advantage of creating essentially the same ButtonBox structure as Insert > Hyperlink...

6/30/16 update:

Originally, this reply reported that either method was a suitable workaround for a hypothetical Mathematica prerelease bug. In fact, the latest update has eliminated the need for such workarounds, because Insert > Hyperlink... now works correctly.