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If you still need the IPA, you can extract it from a (older iTunes versions) or find it on archive sites — but proceed at your own risk regarding malware and app stability.
Would you like help with any specific error code or setup step?
It sounds like you are looking for a regarding Splashtop Wired XDisplay — specifically for using the .IPA file (iOS app package) to extend or mirror your display, likely on a PC or Mac.