Over the last several months, Microsoft has issued several updates to the Power BI Designer, all with an included time stamp in the installer package file.
September 23, 2015, Microsoft released an updated Desktop. Power BI Desktop is now available as download, with the file name of PBIDesktop_x64.msi. After logging into Power BI, simply use the download option, to download the new Power BI Desktop.
Figure 1: Download
During installation, it will remove the earlier version of Power BI Designer. Icon colors have changed to gold and black from the initial green and white. The interface has also been updated to better match the changes they made this week to the website prior to release.
Figure 2: Improved Power BI Desktop layout
Figure 3: The earlier Power BI Designer layout