Not sure why, but when I use the pro version in Aseprite, it looks distorted. However, the free version looks correct.
Viewing post in Eldring Pro - 12pt Serif Pixel Font comments
you may have to increase the font size by 1 or 2 with the pro version as the some of the extra letter are taller than any of the ones in the free version
edit: yeah I just tried it, the pro version needs to be set to 14px, not 12px (sorry about that, the height is set automatically by the program I created it with)