Does anyone know how to install artHACKED.bin on LEDE 17.01.6 or OpenWrt 18.06.1 for TP-LINK WR741
It is against the Community Guidelines for someone to provide that information.
To follow up on @lleachii's comment: the named binary seems to be a way to increase your transmit power beyond the legal limits of your country.
The Community Guidelines prohibit distributing information like this: "You may not post descriptions of, links to, or methods for ... breaking any other law."