The update manager is not a tool that you can download by itself. It is installed with the other tools. Check if you can see the folder "Cypress Update Manager" in the path as shown: C:\Program Files (x86)\Cypress\Cypress Update Manager
Nevertheless, try extracting the file attached with the thread and running cyliveupdate.exe.
If it doesn't work, I recommend you to re-install PSoC Creator from the links given below:
Cypress Update Manager.zip 822.0 K