If you download the installer from the official Microsoft Download Center and run the installer, you may receive this error message “Microsoft Web Platform Installer couldn’t find the product you tried to install.”
The product has renamed the “Workflow Manager 1.0″ to “Microsoft Manager 1.0 Refresh” and it just breaks the installer. The easiest way to download the installer is search on the Microsoft Web Platform Installer.
On the top right corner, enter “Workflow Manager 1.0″. It will return few results and select “Workflow Manager 1.0 Refresh” to proceed the SharePoint 2013 Workflow Manager installation.
I hope Microsoft will fix the links soon.