I was just using RSR converter a couple of hours ago. It's still a slightly better alternative to P3DO if you want transparency in your thumbs, although P3DO has a lot of advantages and it's getting better all the time. Try rendering and saving the pct again. Sometimes they go wrong. Don't forget to invert the alpha channel in Photoshop or whatever image editor you use. If you can't invert the alpha channel then RSR converter is useless.

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