Following is a link to the latest version V3.5.20
Selected Bug Fixes:
Trying to share a dashboard with multiple Active Directory users failed.
Building eCubes to which new Google AdWords tables were added failed.
Removing shared users from dashboards didn't work in some scenarios.
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 here.
Please see release notes here.