Re: App Store" saying “can’t connect the page couldn’t be loaded .try again”
Apple Support's online article (link below) may be helpful:
If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support
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Re: "can’t download any apps"
Download apps and games on your iPhone or iPad - Apple Support
Eg: says:
If you can't find the App Store
If the App Store is missing on your device, you might have Content & Privacy Restrictions turned on.
Adjust your iTunes & App Store Purchases settings and make sure that you choose "Allow" for the Installing Apps setting. The App Store should reappear on your device.
If you still can't find the App Store, swipe down to search for it with Spotlight.
Also see what's needed to: Get apps in the App Store on iPhone - Apple Support
and
what to do: If you can’t download or update apps on your iPhone or iPad - Apple Support