That sounds like the ajax request is not returning anything, which happens if the code stumbles into an fatal error at some point and halts.
If you click on the network tab of your browsers developer tools and check the content of the ajax request after trying a search it should be empty.
Now, try to enable error reporting in the wp-config.php file and try searching again and then examine the new ajax response. It should contain some kind of fatal error message for sure.
WAMP server might have some core modules disabled. I switched to XAMPP a few years back, that's my current testing environment and it corresponds with 99% of the hosting servers. If you don't mind, I would recommend trying it 😉Best,
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