Issue With Custom AI

[Zoldam]

EDIT: I fixed it sort of, I didn't fix the problem, but I found away around it.

Also, on an unrelated note, how do I make the (Human) AI upgrade a tower without building a second scout tower to replace it, I assume some sort of condition, but I was having trouble with it.

 

[Vinz]

Unit group - pick every unit matchig condition
The condition should be Player controller of owner of matching unit equal to computer and unit type of matching unit equal to tower

Unit - issue upgrade order

That should do it.