painter has a free 30 day trial that you can download and use without any restrictions after you've registered it.

as far as I remember, there were no major differences between painter 2019 and 2020, some performance improvements only.

painter's $25 price-tag is a good deal if you like what you see in the trial; makes me assume they've thrown a dated release on sale hoping to bring back users that left corel for its low-cost competitor, paintstorm.