Part of the installation process is to test whether CURL is working properly, since CURL is used by many internal components to talk to outside servers, such as payment gateways for submitting payment requests to credit card companys, and shipping companies to request live interactive quotes for shipping costs, and currency exchange rate updates, and many more things.
The error you're getting on line 252 is happening when the installer is trying to talk to the https://www.zen-cart.com server via CURL to confirm that CURL actually works on your server. In your case it's taking more than 60 seconds to connect to an outside server. That reveals an ugly problem with your server's configuration, which is going to cause you problems down the road when you try to use payment and shipping services, and other things.
There's no good reason for CURL to take longer than maybe a couple seconds at most. If it's taking longer than 60 seconds to do a simple connection, then your server must be configured wrong or CURL is blocked for some reason and the firewall is configured wrong, or maybe something worse.
Time to get your hosting company involved again.
Or use a more reliable and conventional hosting service.
.
Zen Cart - putting the dream of business ownership within reach of anyone!
Donate to: DrByte directly or to the Zen Cart team as a whole
Remember: Any code suggestions you see here are merely suggestions. You assume full responsibility for your use of any such suggestions, including any impact ANY alterations you make to your site may have on your PCI compliance.
Furthermore, any advice you see here about PCI matters is merely an opinion, and should not be relied upon as "official". Official PCI information should be obtained from the PCI Security Council directly or from one of their authorized Assessors.