How do you move an installed upgrade to another slot?
As far as I am aware, there is no way to move installed technologies around once they are installed. This is how the game has been since launch.
One other question kind of discusses this, but with a starship hyperdrive technology (which I don't think you need to craft anymore). Regardless, the only way to "move" an installed technology is to dismantle it, rebuild it, and install it where you want it to be. You'll unfortunately have to take the hit on the wasted materials.
In the Beyond update, released August 14th 2019, you can now move technology to different slots after being installed.
Technology can now be moved after installation.
To do this, simply hover over the technology you wish to move and the "Move Technology" option will be in the context menu.
Image taken from Youtube