Qt v 4.7.2 for Symbian^3 is available to download and this release is supposed to fix the Ovi store issues. Some users have reported that this version of Qt has fixed their Ovi Store problem and running Qt based apps with this version of Qt is flawless. 

Install (N8FanClub.com)Qt 4.7.2 S^3.sis at first and then other installation files.

Let us know whether it solved your issues too?

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