When I merge 7 PDFs(110~148MB each PDF) with CubePDF Page, I got Error "種類 "System.OutOfMemoryException"の例外がスローされました。(OutOfMemoryException), but I have enough Memory room.

PC Spec is below.
Core i9-14900K
DDR5-7600 2 x 24GB
Z790 Mobo
RX9070XT