I found a way.
First, open the fab and search the asset or plugin you wanna download. Then you have to add to your Library. Once you added the assets to the Library, launch the Engine, open Fab.
Locate your library (as step 1 in picture), the assets you want to download will be showed there. There is " + " (plus sign) (as step 2 in picture) beside the asset name. Click it. It will download the asset. Then, the downloaded asset will be locate in your project folder.
Go to your project folder, find the “Engine” folder, cut or copy it.
Go to your linux engine folder, replace the Engine folder and overwrite all.
Restart the engine, open plugin setting, find by the asset name, enable it.
Restart the engine. Now your asset will be ready.
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