To test a WPA/WPA2 network, you need to capture the "4-way handshake" when a device connects to the router.
Double check: The user asked for "wifislax iso". This implies they might have the file but don't know what to do next, or are looking for the file. I will cover both briefly.
You can download the Wifislax ISO from the official Wifislax website.
If you are trying to run Wifislax in , you must understand a critical limitation:
Since Wifislax is a Spanish-origin distribution, the official sources are often in Spanish.