Install using a mod manager compatible with SSE or manually place the two files in your Data folder. Check below for available patches. Ensure that RDO is loaded after mods like Alternate Start.

Patch for Amazing Follower Tweaks (AFT) SE.

Patches for Cutting Room Floor (CRF) + Unofficial Skyrim Special Edition Patch (USSEP), and USSEP only. Installs BOTH by default. Choose the patch that's correct for the mods you're using. Make sure to load the patches after RDO, USSEP, and USSEP+CRF. A patch for Open Cities is no longer needed.

Patch for Extensible Follower Framework (EFF) v3.5.5. (The plugin name is v3.5.6, but it was updated and tested with v3.5.5)

Patch for Extensible Follower Framework (EFF) v4.0.3. (The plugin name is v4.0.2, but it was updated and tested with v4.0.3)

Patch for Immersive Amazing Follower Tweaks (iAFT) SE.