With the MCLeaks Authenticator you can enable support for MCLeaks accounts.
Just download, unpack the ZIP-archive and run the "MCLeaksAuthenticator" file.
Here you find the steps to install and use the Authenticator:
The MCLeaks-Authenticator is the main software, which is required to use mcleask alts. It modifys your local hosts file settings, as well as your local Java certificate keystore, in order to connect to the MCLeaks-network. A click on the MCLeaks-Button enables MCLeaks-Mode for your minecraft, a click on the AltDispenser button enables the Alt-Dispenser support mode for https://altdispenser.net/ for your minecraft & a click on the Mojang-Button resets your minecraft settings to default. It requires administrator permissions on your windows.