I want to point out that the version ( 3.7 ) of Photoscape is made for versions of Windows that are version 8 or older... for newer versions like Windows 10, they recommend their Photoscape X which can be found on the developers website here...
PhotoScape X for Mac and Windows 10
Here is the developers website for v3.7 here
PhotoScape
I always, when possible, only link to the programs actual website. Using 3rd party websites that distribute software are out of the dev's hands and in some cases can result with additional adware or spyware getting installed. The other advantage, anytime a new version is made and released, you don't have to wait on the 3rd party site to update their pages, you get the info directly from the dev's.
Just to point it out... the size limitation is refering to the physical file size and not the resolution size.