Line 272 calls Tool.ShowAllOutput (I assume to make it verbose and output all), but ShowAllOutput is not in TIDEExternalToolOptions class.
But TIDEExternalToolOptions .Quiet is, which, I assume, if set to false (in other words, 'do not be quiet') will achieve the same result as the intended TIDEExternalToolOptions.ShowAllOutput := true;
I was able to install the package after making this change anyway. Hope it works - looks like a great way for packaging for Debian. Thanks for it.