NReco.PdfGenerator is a .NET wrapper around the wkhtmltopdf native binary, which means every PDF conversion spawns an external process. That architectural choice shapes everything downstream: temp directory permissions, Windows security policies, diagnostic depth when something fails. The wrapper surfaces what the executable returns — often just an exit code. That worked well enough when Qt WebKit was a reasonable rendering target. The wkhtmltopdf project's last stable release (0.12.6) shipped in June 2020, and the upstream repository was archived on January 2, 2023. The underlying WebKit fork dates to roughly 2012. The ecosystem moved on; teams running NReco often have not, because migration feels expensive up front. This guide walks through what that calculation looks like today: what still works on NReco.PdfGenerator, where the friction surfaces, and when the math tips toward a modern alternative. For a step-by-step API map, see the IronPDF migration guide for NReco.PdfGenerator .…