Europa Universalis IV gog version - How to install mods? Thanks for answer.

P.S. mods not working for exemple Extended Timeline.
The only way to run the mod is to overwrite the game files - but then the mod doesn't function properly ( the map often contains the wrong culture or religion)

You should definitely not overwrite the normal game files to use a mod.

If the mod which you want is available on the paradox mods website(extended timeline is there), you can just subscribe to it on the website and the launcher will download and install the mod if you are logged into the same paradox account in the launcher.

Alternatively you can download a version of the mod which is intended for manual installation which is often posted in the user mods forum on the paradox website or in a discord server for the mod. Such a version can just be unpacked in the "mod" folder in the eu4 folder in Documents/Paradox Interactive. The next time you start the launcher, it should pick up the mod automatically. But this won't work if you downloaded a steam mod from an alternative source and not from the author of the mod, because the raw steam mods are missing a correct .mod file which you would have to create manually.

Afterwards you can add your new mod to a playset in the launcher and activate it to use it in the game

There is no subscribe button on paradox mods on Windows 7 only download
Unfortunately, after activating the mod it does not turn on in game.
Only my solution works on Windows 7 (overwriting)
Create a mod folder in C:\Documents\Paradox Interactive\Europa Universalis IV GOG.

If the Europa Universalis Extended Timeline screen does not appear when loading the game
Replace the game files from the gog.com folder where the game is installed with the mod files
To install the new mod, rename descriptor.mod to the name of the mod
Open the file in notepad
and add the line:
path = "mod/Name of mod" e.g.: path = "mod/Extended Timeline"
save the file
Move the files to one folder with the same mod name
copy the file changed earlier path above next to this folder

You also have to manually tell the game to load the mod. You do this in the "dlc_load.json" file (in your .../documents/paradox/europa universalis folder). It should look like this.

{
"disabled_dlcs":[],
"enabled_mods":["mod/ExtendedTimeline.mod"]
}

No need to ever use the horrible launcher again.
To add several mods, like this:

{
"disabled_dlcs":[],
"enabled_mods":["mod/ExtendedTimeline.mod", "mod/mod2.mod", "mod/mod3.mod"]
}

And so on.
NEVER replace vanilla files. Mod file structure should look like this (...documents/paradox/europa universalis/mod):

ExtendedTimeline (folder)
ExtendedTimeline.mod

And like you said all the .mod files need the path like this: path="mod/ExtendedTimeline"

This works for all the Paradox games that use the new launcher.

Oh and another thing that might help with crashes, especially if you have tried out several different mods (or if mods have been updated). Delete all the temp files in your "documents/paradox/europa universalis".

[Folders]
cache
crashes
dumps
pops_filestorage
shadercache
exceptions
logs
gfx
[Files]
continue_game.json
pops_filestorage.index
-------------------

There are a few other files, but those are mostly just in-game settings, so no need to delete those, unless you want to change all the settings the next time you launch the game.

Thanks for answer.
I added the full path in the Extended Timeline.mod file and the mods work fine without replacing files
The game runs on Windows 7 64 bit

The button to subscribe to a mod is independent of your OS and should always be there. It is immediately left of the download link and called something like "add latest version" (it is not literally called "subscribe").

The download link on the other hand gives you an incomplete mod and requires you to create the folder and the modname.mod file yourself with the correct path. That's why I recommended to use a download from the mod author which should included these files and can just be unpacked in the folder "C:\Documents\Paradox Interactive\Europa Universalis IV GOG/mod"