Adobe connect lecture

The links look to me like they are on an Adobe Connect account that is expired. So you will need to reach out to University of Bristol and see if they have the recordings saved somewhere else.

I'm assuming that the URLs for those lectures were for the live session(s).

If the professor and/or technical support didn't record those sessions, there's nothing to see. Especially if the professor uses a new URL for every session. But if your professor and/or technical support recorded and moved the recording to another platform (schools do that sometimes) and it's open for your access, there's a chance that they may still be available to you.

I'm afraid that your only shot is to get with the original creator(s) to find out if the content is available to you.

Wish I had a better answer for you,

Randy