physkets [1] filed a orphan request for netextender [2]:

The checksums and some package names haven't been updated in a while,
and it doesn't work anymore. The comments detail the specific changes
required.

Maintainer had promised changes a month or two ago, but no changes
have been made.

[1] https://aur.archlinux.org/account/physkets/
[2] https://aur.archlinux.org/pkgbase/netextender/