Hi spidersaurus,
I've already seen a few times, some corrupted installations of the arduino.
If uploaded you the full preconfigured arduino ide :
https://drive.google.com/file/d/1kdTDdhCEc03ReFQeNbx993Tvvz6Nyqfv/view?usp=sharing
Could your try to uncompress it and copy the arduino folder from the zip into C:\Program Files (x86)\SimHub\_Addons
So the folder structure should looks like
C:\Program Files (x86)\SimHub\_Addons\Arduino\ ... (make sure not to have C:\Program Files (x86)\SimHub\_Addons\Arduino\Arduino\)
And try again upload as seen in the doc or AMStudio video.
If it still goes wrong :
Make your configuration as seen in the doc or AMStudio video, but instead of upload click on "open in arduino ide"
View attachment 224716
The arduino IDE will open then choose your board type :
View attachment 224717
Choose your arduino serial port :
View attachment 224718
Finally click on "upload" :
View attachment 224719
You should find the compilation errors right on the bottom:
View attachment 224720
It may look a bit unreadable, but don't worry simply copy them to me