USB Encryptor is a green program with powerful features. It does not need to be installed, just simply unzip the "ude.exe" file in the zipped package to the device you want to use.
You can also unzip the "ude.exe" file to a folder in the disk, but the folder where the program located cannot be encrypted.
Open the "ude.exe", enter the password to start USB Encryptor, and you can encrypt files and folders in the disk.