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If you don't want to use your distribution's Qt just remove it, if you want to have both, then start by removing the one you downloaded, then check that you have all Qt 5 dev related packages installed then you can re-install the one from qt.io
Hi,
Please don't post the exact same question in unrelated sub-forums
Duplicate
Closing this one
Like I wrote, first thing to do is install g++ from Fedora's package manager
