From Highlander 2 Wikipedia:
On the planet Zeist, a last meeting is held between the members of a rebellion against the rule of General Katana. The rebellion’s leader, Ramirez, chooses "a man of great destiny" from among them — Connor — to carry out a mission against Katana. At this moment, Katana and his troops attack, crushing the rebellion. Katana orders his men to capture Ramirez and Connor alive, and kill the rest of the rebels. The two captives are put on trial by Zeist’s priests, who sentence them to be exiled and reborn on Earth in pursuit of "The Prize." Winning the Prize gives the victor the choice to either grow old and die on Earth, or to return to Zeist. Katana is unsatisfied with their decision, but the sentence is executed, leading to the events of the original 1986 film.
As such a 4-part question arises:
Is everyone on Zeist immortal in general (e.g. lives for at least several centuries)?
If "no", how did Katana manage to survive on Zeist long enough to wait from back-when-Ramirez was sent to Earth till 2024?
Is anyone/everyone on Zeist an Immortal with capital "I" (e.g. possesses all of the Immortal properties from Highlander mythos, not merely long life? Is there The Game, Quickening, etc... on Zeist?
If not, is everyone from Zeist an Immortal when beamed to Earth (ala Superman mythos)?
Please note that the question seeks primarily in-universe answers (but not necessarily sourced from the movie itself); and applies only to theatrical version of the movie, not alternate cuts where the events in the quote above happen on Earth in the past instead of on the planet Zeist.