InstaUp2Date error

I'm attempting to use InstaDMG/InstaUp2Date (Rev 254) to make a 10.5 image. Doing this on a 10.5.8 machine, with Python 2.5.1 (r251:54863, Jun 17 2009, 20:37:34). I'm using the 10.5 vanilla catalog, called within a "master catalog" file that looks like: [code]include-file: 10.5_vanilla.catalog include-file: customSoftware.catalog include-file: iLife09_Updates.catalog [/code] I'm getting the following error while checksuming MacOSXUpdCombo10.5.8.dmg: " File "/Volumes/LaCie_do_not_image/instadmg_from_svn/AddOns/InstaUp2Date/checksum.py", line 162, in checksum httpCode = readFile.getcode() AttributeError: addinfourl instance has no attribute 'getcode' " I get the same error when using checksum.py on http://support.apple.com/downloads/DL866/en_US/MacOSXUpdCombo10.5.8.dmg. Do I need to update my version of Python?