What is the exact issue you are facing there?? Are you not able to download the sizing Tool, I can download it just fine, might be some issues with your CCO Access
I click on the HTML link then I have a logging prompt (even if I am already login in previously).
Once I am on this logging prompt I am unable to login in and download the sizing tool.
Normally my CCO access is OK as I am allowed to use all the partner tools.
Thanks for your prompt support.
There is a support link on that page at the bottom left with an email address, you might want to try that. I just tried the download link and it worked for me.
If that's the case, you might want to send an email to the email@example.com address on the registration page so that they can take a look at your account.
I faced the same problem.
The Unified Communications downloadable sizing tools help you with the task of sizing Unified Communications deployments."
You might want to check your access then as mentioned above by emailing them for instance.
I just clicked on http://tools.cisco.com/cucst and entered my credentials.
It then took me to a page that has Collaboration Sizing Tool download link on it (I'm guessing that's what you want) as well as some other items.