How do i add addons to my 1.20.1 server

[wide orbit]

ive been trying to add this sit addon to my 1.20.1 server but it just doesnt add idk if its just me being dumb or smth but it just doesnt work

[rocky field]

Download the plugin here: https://www.spigotmc.org/resources/gsit-modern-sit-seat-and-chair-lay-and-crawl-plugin-1-13-1-20.62325/download?version=505528

but it in the plugins folder and restart the server

[wide orbit]

does it have to be spigot?

im using a weird computer and it doesnt let me download it could i be able to use any other ones?

[rocky field]

No:
https://hangar.papermc.io/Gecolay/GSit

https://github.com/Gecolay/GSit/releases/download/1.4.10/GSit-1.4.10.jar

https://www.9minecraft.net/gsit-plugin/

[wide orbit]

tysm