Ey,Understand that the package is simply outdated. Checksums not passing either indicate that or a broken download. See https://aur.archlinux.org/packages/dropbox-cli for instructions.
When an AUR package has a problem, go to its AUR package listing, comment about the problem if there are no comments about it, and check the comments for instructions. If the package is outdated, flag it as outdated. If the package has been flagged outdated for over two weeks, submit an orphan request.
Bear in mind that due to the Arch philosophy, people usually encourage users to understand the process of everything: in this case, the AUR package install process.
-- Cheers, Aᴀʀᴏɴ
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