cant update cis

2 days ago cis started warning me about not beeing updated, and since then i can not update it

are the update server’s are down?

when i try to access download.comodo.com i get a 404 error

Welcome.
What a version at you CIS? ( Last version 7.0.317799.4142 )
For me updating for versions works is fine.

when i try to access download.comodo.com i get a 404 error
It is not necessary to look at it.

Go to my posts under yours, and read from the start. If you see red X’s when you click update, than you have the same issue I had. It may take a reinstall, if so, know what your up against, and what you will end up having to do to reinstall even what you already have installed.