Cell doesn't have a WoW Forever version yet. Its CurseForge page lists Retail and the Classic versions but not Forever, and its GitHub repository has no Forever TOC file. None of its release notes mention Forever or the 1.60 client. We checked on 10 November.
Whether the Classic build runs in Forever with "Load out of date AddOns" ticked is unknown. Nobody we found has shown it working, and a raid frame addon that half-loads is worse than none in a dungeon.
The closest thing: Nucleus
Nucleus by NeRggY describes itself as a Cell-inspired frame addon, and it's built for Forever 1.60.1. Its author says it shares none of Cell's code, and it can import Cell profiles, which helps if you set Cell up on another version of the game. Version 1.0.9 came out on 9 November, so it's being updated during launch.
Other raid frames that work
VuhDo has a Forever file in its main build. Our VuhDo guide covers which file to pick.- Grid2 works in Forever and is lighter on options than VuhDo.
- HealBot works and is the easiest of the three to set up.
All three have click-casting built in. Our best healer addons page compares them, and click-casting covers the setup.
Or use the default frames
Forever's own party frames can switch to a raid-style layout in Edit Mode. See raid-style party frames. That's enough for many players in five-player dungeons.
We'll update this page when Cell gets a Forever release. Its add-on page shows our latest check.