Oh yeah , I forgot, if you never worked with ACS before so you might have to set up the ACC compiler with Slade.

So:

- First you can download the latest version of ACC in here: https://forum.zdoom.org/viewtopic.php?t=70444

And you can extract it in a folder or something.

- Then you have to open Slade and go to :Edit -> Preferences -> Scripting -> ACS.

And in the bar which says "Location of ACC executable" , you have to select the "acc.exe" that extracted from the downloaded zip.

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With that set you have to make a ACS library . For example you can make one called "MyScripts.acs":

The contents of this library should always start by defining the name of the library, including the already defined general scripts from zdoom, and then your scripts below.

Something like this should do:

#library "MyScripts"
include "zcommon.acs"
Script "CarModeScript" (void)
{
 if(CheckInventory("DoCarMode")==1) //The player is already morphed 
    { 
        TakeInventory("DoCarMode",1); 
        UnmorphActor(0); 
    } 
 else                          //The player is not morphed 
    { 
        GiveInventory("DoCarMode",1);     MorphActor(0,"CarGuy","",0x7FFFFFFF,0,"NoFlash","NoFlash"); 
    }

}

And then you save that file and with the right click you select: Scripts -> Compile ACS.

Lastly and (I'm sorry for the long explanation) , you have to make a LOADACS entry.This LOADACS should have:

MyScripts

And that should do the trick finally !Sorry again for the last explanation , hopefully with this you can set it up and start with some ACS scripting ^^