If for some reason version 2.1.3 is failing downloading, just uninstall and re-install. Something went wonky with the release.
Roll Group Initiative from the Combat Tracker in Foundry VTT
Make one roll for an entire group of identical creatures (the same actor) directly from the Combact Tracker's "Roll NPCs" or "Roll All" buttons
Skip combatants in a group except for the first found in said group.
Group same actors into a header group.
When adding a new combatant (to running combat) and there's already initiative for another combatant of the same actor, then use the already rolled initiative.