Login to Mentor Support Center. (If you do not have an account you can register for an account following the link as well.)
On successful login you should see a welcome page like this:
If you do not see the above screen, you can add the 'A2B Solutions' to your homepage via the "Manage Account" action on the top right side of the page.
Clicking "A2B Solutions" should take you to downloads page (If it didn’t, URL: https://support.mentor.com/en/product/1019174945)
Click on Download A2B Solutions software
Once you click the downloads link, you should see several download bundles for A2B Analyzer software. You can download the ones you are interested in from there.
Note that the "ASIO Driver" software cannot be downloaded from this link. For this, you will need a direct link to the download page, provided via an email from Mentor. If you do not have this email, please check within your organization with the department (usually Purchasing or Finance) that placed the order.