Following is a link to the latest version V4.0.221
As best practice for any Platform upgrades, it is recommended first to install those programs in a test environment and check all of your ElastiCubes and PSM files. Only when you are sure that everything working well, it is suggested to install the new version in your production environment.
Please read the installation guide for detailed instructions. This guide can be found at the link below (copy and paste into a browser).
Download link (copy and paste into a browser):