PermissionsEX not in installable plugins?

Hi all,

I've made servers before but decided I wanted to have a fresh start, and I've been able to get PermissionsEX on here before. However, this time around, I'm seemingly unable to find the PermissionsEX plugin in the list of installable plugins (I did search, yes). All I can find is stuff like bPermissions, zPermissions, and so on. Has PermissionsEX been removed?

Thanks.