Hell freezes over, MS Paint adds support for layers and PNG transparency
stopthatgirl7@kbin.social to 
arstechnica.com
Automated background removal was also added recently.
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stopthatgirl7@kbin.social to stopthatgirl7@kbin.social to
The commenter you replied to literally wrote the computers are locked down, ie no way to install any new software.
https://portableapps.com/apps/graphics_pictures/krita-portable
There's a portable version that might work.