Official technical support for 1.12.x versions is limited as the developer, Celsys, has shifted focus to the Version 3.0 lineup .
Updating to the latest version of the 1.x series (1.13.2) is recommended if you do not wish to move to the subscription-based Ver. 2.0/3.0.
Creation and management of comic/manga projects with unlimited pages. clip-studio-paint-ex-1-12-11
Resolved an issue where the software would occasionally fail to verify licenses on startup for some users. EX Version Specifics
Converting 3D models and photos into line art and tone layers. Official technical support for 1
Improved stability when saving or exporting large multi-page files (a key feature of the EX version).
According to the official release notes, this version addressed specific technical issues rather than adding new creative tools: Improved stability when saving or exporting large multi-page
As this report concerns the (Extended) version, it includes all "Pro" features plus the professional publishing suite available in 1.12.11: