The only available phpBB download is of the newest phpBB 3.3. But in the styles database I don't see any styles for 3.3, mostly for 3.2<.. Are they compatible with 3.3?
They need to be updated to work with 3.3. Some are in the validation cue already, mine for example but if you use one of mines you can already download them from the link in my signature
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New version of phpBB has been released? My styles aren't validated for it yet? Check my page for the latest downloads!
Not even 24 hours further and 8 submitted styles are already validated (prosilver is by default anyway).
Anyway, the answer to the topic_title question is: partially!
The 3.2.9 version will probably be more suited but it will still be only: partially.
Generally the style you use should be specifically tailored for the phpBB version you use.
Spelling is freeware, which means you can use it for free.
On the other hand, it is not open source, which means you cannot change it or publish it in a modified form.