Could not launch file: "C:\Users\...\AutoHotkey\AU3_Spy.exe"
This happens because Window Spy's executable is not included with the ZIP version of AutoHotkey.
If AU3_Spy.exe is extracted from AutoHothey's EXE installer and placed in the root directory for ahk.zip, Window Spy will work as intended. (See What is AU3_Spy.exe? Where can I find it?)
Is there a reason Window Spy isn't included with AHK.zip?