This addon simply automatically accepts resurrections. By default, it will not accept resses while the resurrector is in combat, this is useful if you for example have a druid that combat resses you while the group is wiping, and you want to save the res for when the pack has reset. You can change this by using a command.
This addon was made for WoW classic, but it should work for retail too.
/arc – To list all commands
/arc combat 0 – To not automatically accept resses while the resurrector is in combat. This is the default.
/arc combat 1 – To automatically accept resses even if the resurrector is in combat. Setting this to 1 will also make you automatically accept resses from people outside of your party/raid.