There is no toolbox

[PegiMessi]

Hi
I have trouble installing the SlicerSPECTRecon module into the 3Dslicer 5.6.1.
After I got the message “installed successfully,” the module appeared on the module list, but it didn’t work, and there wasn’t any toolbox I could work with.
https://drive.google.com/file/d/130fw_m1HY3Dg5hvH0AKWArsekjt3hd5g/view?usp=drivesdk