I think I've got the same setup as you.
Just go to 192.168.1.1 in your browser that should take you to your Linksys setup.
Type admin as your password which should be the default. You can leave the user name blank.
Once inside the router setup you should see MAC address clone in the Setup tab
Change the last two letters/numbers in the user defined entry, if it's something like C5 change it to C6 or whatever you want. Clink save settings.
You'll lose your internet connection. Now go to your modem, unplug it for 10 seconds and plug it back in. Do the same for your Linksys router, unplug for 10 and plug it back in.
Once everything is reset, you should have a new IP address.
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