pap.er 5.3 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. Pap.er for Mac lies within Theming Tools, more precisely Wallpapers. The actual developer of this free software for Mac is Meiyuan.
From the developer:
pap.er is an elegant wallpaper application for macOS. The program delivers fresh and stunning wallpapers every day. You can find random wallpapers in 'My wallpapers'. Therefore, you just need to browse the wallpaper library and select the image you prefer most.
You may want to check out more Mac applications, such as World Record Paper Airplanes, Papa Penguin or Paper World - Spot The Differences, which might be similar to pap.er.