looks like epo cant get to myavert.....do you have a proxy in your environment.....goto epo, server settings and look for myavert settings if you need to enter a proxy.
the latest check failed, but it is only the check because your repositoy has the correct version in it so it is updating.
You might want to consider these two support articles:
KB70683 - MyAvert check fails to update in the ePO 4.5 console
KB71126 - MyAvert links in ePO 4.6 / 4.5 fail to connect via Blue Coat proxy
But most importantly you should consider this one please:
KB76892 - EOL for ePolicy Orchestrator 4.5
ePO 4.5 is end of life as of Dec 31st last year !