IE9 has no problems with McAfee and vice versa. Assuming IE8 is a final version then you should be able to simply install over the top of it.
By the way I got rid of the email part of your user name for your own safety and privacy.
SAAS – we term it for our small business products . Could you please confirm if you are referring about Home version or Enterprise versions of McAfee programs ?
They said they had SaaS and I overlooked that, sorry. Moved this topic accordingly.
You will do just fine with the upgrade. No worries what so ever.