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Yes, but code rework is needed inside procedure UltraArc. Or simply use the example for freearc unpacking for inno setup (isdone example) and replace procedure UltraArc with the example and call it on CurStep ssInstall.
The function you are looking for is ISArcExtract (possibly with a records.inf file, but not needed). I think there are some old scripts here which use this example (or sort of). If I'm not mistaken the old blackbox script use this too.
The records.inf file is only needed if you don't want to edit the script for each archive/size every time (it is like records.ini, but with addition for archive sizes, percentages, etc.).
I don't know if you can use components then, but I don't think so.
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