Just follow this tutorial and convert it your self.
(https://www.youtube.com/watch?v=xaaVK-F ... jbk0h00410)
EDIT: Nevermind the converter doesn't work with this one, but those with others i tested...
EDIT 2: It does work, just make sure to update the 4nxci to latest version. Other wise it won't work! And delete any ticket associated with Sonic Mania before installing Sonic Mania Plus! (Using tinfoil.)