if you don't have admin rights or want a less complex way to "install"
right click desktop, select create launcher (if your DM doesn't have this option, poke around in setting most modern display managers have this facility)
in the dialog presented (I'm using xfce so exact details might differ)
fill in name, asset forge!
click to the right of command text field, in the file dialogue navigate to where you extracted asset forge and select Asset Forge.x86_64
click the button that says no icon (labelled icon) and select image files on the dropdown to select a file image instead of a system icon, navigate to Asset Forge_Data/Resources/ and select the asset forge png
you can leave working directory, comment and so forth blank
finally click create and you're done.