Players can now upgrade ship device and bay modules if the module is upgradable. (Only modules listed as a level I, II or III module can be upgraded.) This is done from the Edit Fleet Screen and the module must be installed on a ship. The cost to upgrade is 150% of the difference between the cost of the current module versus the cost of the upgraded module. This makes it more expensive to buy a lower level and then upgrade it later. But it’s nice to have the option. Also you can only upgrade 1 level at a time.
For example if you have a Large Fighter Carrier and it is has a Fighter Squad I, you must first upgrade it to a Fighter Squad II and then to a Fighter Squad III. Then when you upgrade the ship to a huge ship you can upgrade to Fighter Squad IV.
When you mouse over a modules icon while it is installed on a ship and the module can be upgraded, the tooltip will tell you to LMB on it to upgrade it and it will show you the cost in GMU’s. The tooltip will also display the message that you can RMB click to un-install the module too.
This will make it much easier to keep your fleet's battle strenght at it's maximum capacity as you upgrade the ship sizes.