Saves from version 3.5 or earlier are generally not compatible with 3.6 due to the massive changes in ship logic and traditions.
If your query is about how to get the file working, please be aware of the following: File: Stellaris.v3.6.0.Incl.ALL.DLC.zip ...
If you are looking for how to play this specific version, here are the major highlights and changes introduced in the 3.6.0 update: Saves from version 3
In many of these versions, DLCs are managed by a .ini file (like steam_emu.ini ). If the DLCs aren't appearing in-game, you often need to ensure the "DLC Unlocker" included in the zip is correctly placed in the root folder. Files labeled with "Incl
Files labeled with "Incl.ALL.DLC" from unofficial sources often carry risks of malware or miners. It is highly recommended to run a full system scan if you have already downloaded it.