I'm coming across more and more Inno setups that UE is unable to unpack, such as; perfectuninstaller.com/PerfectUninstaller_Setup.exe The error data from UE is; Signature detected: Inno Setup Setup Data (5.2.1) This is not directly supported, but i'll try to unpack it as version 5110 ; Version detected: 5201 Critical error: The setup files are corrupted. Please obtain a new copy of the program. Unpacking failed. This version is not supported.