NOTE: I am unable to provide a file upload for this mod, so you will have to do this yourself. Don't be intimidated -- it's a simple process and takes little under ten minutes. The available download contains a .txt file with the instructions step by step.
You will require:
Skyrim Legendary Edition
Sea of Ghosts from the Steam Workshop
SSEEdit
Bethesda Archive Extractor
SSE Nif Optimiser
SSE Creation Kit
I have just played through the mod in its entirety with no complications whatsoever running Legacy, People of Skyrim, etc.
This also works for any mod that doesn't have an SKSE folder EXCEPT if they have an .esp as a master -- the CK removes these from the masters when resaving and the plugin will stop working. If desperate, you can esm-ify those esps with wyre bash and back without issues.