In this save there is a large four-story raft with a bunch of boxes and resources, all the drawings have been studied, a bunch of biostorages, 8 motors

And most importantly, all the islands have been completed except for the last floating city (it is only half completed, the staircase to the city itself has been opened and a couple of houses have been raided)

Unpack the archive to any convenient place, and then throw the unpacked folder here: for pirates:

C:Users[username]AppDataLocalLowRedbeet InteractiveRaftUser[userid]World

for steam:

[Steam folder]userdata[user id]648800remote

for example

C:Program Files (x86)Steamuserdata[user id]648800remote