Open Device Manager
Press Win + R, type devmgmt.msc, and press Enter.
Add Legacy Hardware
In Device Manager, click Action > Add legacy hardware.
Click Next in the wizard.
Install the hardware manually
Select “Install the hardware that I manually select from a list (Advanced)”, then click Next.
Choose Network Adapter
From the list, select “Network adapters”, then click Next.
Select Microsoft Loopback Adapter
Choose Manufacturer: Microsoft
Then select Microsoft KM-TEST Loopback Adapter
Click Next, then Finish to complete installation.