From esko site download "i-cut_preflight_10_0_b5.dmg"
After install right-click on the app and choose "see package content".
In Contents/MacOS/ you find the black icon unix app "i-cut-Preflight".
Open it with an Hex-Editor (Resorcerer or HexEdit or else) and find that 2 hex:
you can change first one or second one or both.
Only the registered members can see the download links/content. please Register to gain full access.
It's not important: results are the same.
Save and launch: in the about box you'll see "not activated", but it works.