cbb [1] filed a deletion request for dex-editor [2]:
Upstream hasn't made a commit in nearly 3 years. There's an improved and actively maintained fork that's also available via AUR (https://aur.archlinux.org/packages/dte/) and basically supersedes this package.
[1] https://aur.archlinux.org/account/cbb/ [2] https://aur.archlinux.org/pkgbase/dex-editor/