Transport Tycoon Forums

when I go in NewGRF impostation I can't use the NewGRF pocket who I've installed

there's two separate "newgrf" folders, one for putting manually downloaded newgrfs, and one for the ingame content downloader.

https://wiki.openttd.org/en/Manual/NewGRF , I hope this helps , the biggest error people make after download is not activating.

thanks a lot

but is possible to put a NewGRF in a save who hasn't them?

no

Serious I can't apply NewGRF to a world already created?
My screen in a world:

You definitely can, but you are discouraged from doing so. It can cause issues with the save, so do it at your own peril.

Edit the openttd.cfg on your computer:
https://wiki.openttd.org/en/Archive/Man ... penttd.cfg

Set the tag scenario_developer to true in this cfg file, save it.

Any issues that happen due to this is on you though. Don't report it. Make a backup save, just in case something goes wrong.

To be clear:

The kind of errors you can get if you add a NewGRF to an existing save are weird.
The errors might not show up right away, but sometimes only appear much later.
The kinds of errors can be all sorts, like wrong cargo types, errors in graphics, some vehicles not working, some industries not working, almost anything. They are often not "message" or "crash" errors, but just things working wrong.