I seem to make the same mistake every time there are updates, so this time I am documenting it.
I first always go to Installations & Upgrades at support.sap.com/swdc , but if you have Design Studio 1.x already installed, I don't recommend it:
As of tonight there is no data available
Then I checked Support Packages & Patches - success!
There is a 64 bit and 32 bit version available.
After downloading, I am prompted for an update and click next
Success!
As before, the plug-ins need to be re-installed, which prompts for a restart.
For fun I try out the report-to-report interface, with a BEx query that already has this set up on the back end.
The product availability matrix is also updated here for 1.4: https://websmp107.sap-ag.de/~sapidb/012002523100018972812014E/PAM_Additional_Info.pdf
The release note is not released externally yet however: SBOP Design Studio 1.4, note 2044609
The SAP 1.4 official tutorials are already available:
Design Studio 1.4: What's new in SAP BusinessObjects Design Studio 1.4
Design Studio 1.4: Manipulate a Crosstab using a Context Menu
Design Studio 1.4: Create a Global Script Function
Design Studio 1.4: Create an RRI Jump Target
So time to check things out