For those of you who downloaded RA 5.5, please apply the following hotfix, to address couple of performance issues in the new web designer.
Please note that this fix require a GA build of RA 5.5.
The link, ftp://ftp.ca.com/ReleaseAutomation/Fixes/RA_471/RA_550_Cumulative_b842_64547110837220992.zip, provided in the page you mention is not valid.
It should contain an additional pub/releaseautomation in the path so: ftp://ftp.ca.com/pub/releaseautomation/ReleaseAutomation/Fixes/RA_471/RA_550_Cumulative_b842_64547110837220992.zip
Also this is not where you would expect the fix to be, since it is a 55 fix which is now located in the 471 folder on the ftp.