The easiest way of doing this is to take advantage of the “Production” version feature of DataMiner. (DataMiner Help).

This way you can keep all your elements in the same version and anytime you want to upgrade them all at once you can just set the new version as production.

Do note that if your elements are not already assigned to the production version you can use the Export/Import feature to set them all to the production version (DataMiner Help)