Fab tools installation problem

Hi everybody，

I met a problem when I tried to install the Fab tools. 

At first, i couldn't install it successfully, I drag and drop the containing "FabTools.gha" file in the Grasshopper Window, but nothing happened. Latter, I tried to uninstall rhino and gh and reinstall them, the fab tools can display on the toolbar, however, none of them could be drag down to the canvas. Everytime I try to drag the component, a window appears：user object failed to deserialize.The image I send by attachment. Could you please help me to solve this problem? Thanks!

Best regards,
Fengjiao