SSE isn't enough. Your processor must support SSE2. But there must be something else in play here, because the SSE2 requirement has been around since version 0.3, and you've indicated you were able to use version 0.6. So unless you were patching and compiling your own version of 0.6, it's probably not the SSE2 problem. That doesn't mean that Qt5 hasn't introduced some other special instruction code that your processor is lacking, however.
You could try Dependecy Walker (depends.exe) for Windows and see if it reveals any missing dependencies, but it probably won't help if it's a processor instruction issue.
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