You could add blank pages and pages from other PDFs with the 'Pro' tier for example, but chequered or lined pages were locked behind the subscription model. The distinction between the perpetual 'Pro' tier and the subscription model was arbitrary at best.
Development for this version was pretty much halted years ago and new features where only available with a subscription model. It was priced around 10 units of the local currency (Dollar, Euro or whatever) for the perpetual 'Pro'-Version. You could easily add pages and annotations to PDF documents and it was widely used in university, school and similar environments. Drawboard PDF was a popular PDF mark-up tool.
