just open the project, wait for it to load, go to a random corner, right click, inspect element, go to console and paste this:
Object.assign(document.createElement('a'), {href: URL.createObjectURL(await vm.saveProjectSb3()), download: 'project.sb3'}).click()
(You gotta go to "penguinmod" to open, it's like scratch but way better, and disable sandbox when opening, no you cant post this in cocrea)