Because 1.5.4 is an older version, you may encounter modern installation issues:
Compared to the "PRO" version of the same era, EX 1.5.4 provided specialized tools for multi-page projects and high-end animation: Multi-Page Management Clip Studio Paint EX 1.5.4
: View and organize an entire book’s worth of pages in one window [ 10 ]. Because 1
Ask any veteran webcomic artist or professional illustrator who used CSP between 2015 and 2017, and they'll speak of 1.5.4 in hushed, reverent tones. Why? Because 1.5.4 is an older version