The PS220x user manual may be found on your hard drive in C:\Program Files\Pico Technology\PicoScope6 or, C:\Program Files\Pico Technology\Pico Full (for PicoScope 5).
The PS220x series uses the PS2000 Programming Guide which is installed in the Pico Technology Programs folder but, requires that you install PicoScope 5.
The drivers and programming examples are available as follows:
During software installation when prompted for 'setup type' select 'Custom' and ensure that 'programming examples' are installed by removing the red cross. The example programmes will be installed on the root drive in the following directory: C:/Program Files/Pico Technology/Pico Full/Examples