Older versions of iPhone OS aren't new enough to have modern certificate authorities trusted, meaning only sites using older certificate authorities are able to have a secure connection.

Here are links to modern Certificate Authorities that may not be trusted on older devices (some other complications may prevent sites using these certificates from working, those can not be fixed by these.)

Thundercats 1985 Complete Series Download Best ((new)) -

: Provides digital purchase options for the original series. Streaming Options (With App Downloads)

Digital purchases allow you to download episodes to your device for offline viewing via the retailer’s app. This is the most convenient "download" method for modern devices. : Offers the ThunderCats (1985): The Complete Series (Bundle) , which includes all 130 episodes. thundercats 1985 complete series download best

: Available for purchase starting at approximately $2.99 per episode . : Provides digital purchase options for the original series