Replacing it is an easy DIY job.
Take a picture of the current wires. Normally each is a different color. Write down where which one is connected... Power, Common, 1, 2, 3, 4...
Unpower old unit. Swap in new one. Connect wires to same named terminals. Plug it in. Set up wifi.
Newer controllers do not need any rain sensors or other junk. They connect to weather stations to know how much rain is expected, and has fallen, so they about watering before it rains.
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