1. A method for updating at least one software product installed on a virtual machine, the method comprising: providing a software image of at least one new virtual disk storing a new level of the software product together with new metadata comprising an indication of at least one new activation procedure of the new level of the software product; and replacing a current level of the software product with the new level of the software product, the current level of the software product being stored in at least one current virtual disk of the virtual machine together with current metadata comprising current activation information of the current level of the software product, wherein the replacing comprises: removing the at least one current virtual disk from the virtual machine, adding the at least one new virtual disk to the virtual machine, and running the at least one new activation procedure according to the current activation information.