FarSync FAQ – Windows
There is a known problem that when using Windows 7 and you have updated your drivers to Version 6.2.7, or if you have installed a fresh copy of Version 6.2.7, that the device no longer works. If Device Manager reports an issue with the driver saying that it “cannot verify the digital signature for the drivers required for this device”, then the issue is that the version of Windows 7 that you have does not have the Windows Update installed that support SHA2. Please install Windows Update KB3033929 to resolve this issue.
Version 6.2.7 of the Windows drivers was the first version to use SHA2 digital signatures.
The solution to this problem is to press No, then turn on the .NET Framework 3.5 as follows: