changeMAC is a small program that changes your MAC address (on restart or manually). This prevents your device from being tracked in wifi networks, enabling you to use the same free-but-for-a-limited-time network multiple times and also circumventing per-device online-time limits. It's settings are accessible via an user interface.

After opening the program, choose the network adapter you want to set the settings for from the dropdown list. In the lower part of the window, you'll see all actions:

This program only works when you're on windows and have admin rights.

If you have issues with a specific network adapter, select it from the dropdown list and click reset settings. Now open a cmd window by pressing Win + R and type getmac /v /fo list. Look at the network adapter and note the first three (of six) octets of the mac. Write these down in the OUI field.

Note: after pressing reset settings, you'll need to again choose the right adapter from the dropdown list.