Once you have Vectric Aspire 10.5 installed, finding the manual is straightforward. Do not search the web; search your local drive instead.
Disclaimer: This article is for informational purposes. Vectric Ltd. and Aspire are registered trademarks. Always use official software and documentation provided via your licensed installation.
He opened it. 1,247 pages. And there, on page 678, was a diagram showing exactly how to set the merge mode for overlapping reliefs.