Poser 11 is still needed for E-on Vue integration, as it has the required SDK. Vue is free these days, so it may be a useful add-on, especially if you do landscapes, or want to export Poser to other software. Poser 11 can co-exist happily with Poser 13, so why not just have both - then you can do Vue and also run any older Poser scripts as well.

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Learn the Secrets of Poser 11 and Line-art Filters.