This is Reflate Only V2.
only compress with reflate and then you can use any compatible compression for innosetup.
this is the code for inno to unpack reflate in bat
Code:
[Run]
;reflate bat file
FileName: "{app}\BundlePC\ReflateUnpack.bat"; Description: "ReflateStuff"; Flags: nowait postinstall skipifsilent;