For the 2018.10.17 release, we have an important bug fix, related to the new release of InDesign CC (2019), and some new PageSequence files.
The bug causes IDImposer to crash or silently quit when a user upgrades to InDesign CC 2019.
The new ‘PerfectPlus’ PageSequence files are targeted mainly toward those customers who produce 1 copy of a custom book. It’s like the “Perfect Bound” Imposition Type, except that you can fit more pages per sheet, if you use larger sheets of paper. In fact, “Perfect Bound” is a special case of ‘PerfectPlus’, where the layout is “2×1” pages per surface.