You can just ignore that. Winrar works fine for me without buying it
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Yeah, 7zip is great when you're doing theme work, framework and other stuff. WinRAR can be used too but 7zip has better compiler tools than WinRAR.
If you download from public or private torrent sites, most of them have WinRAR with serials and stuff to get rid of that pop-up. As the others say, just ignore it. None of the tools will become unusable when ignoring and not paying WinRAR. It will continue to all work regardless of what you do.