I managed to solve the problem by installing PicoSDK 64bit ver 10.6.13.58 which supports the 5444D MSO.
Thanks.

Hi I'm trying to connect my PicoScope 5444D MSO to Matlab R2018b with Instrument Control Toolbox and have followed the setup instructions in the YouTube video 'Using PicoScope Instrument Drivers with MATLAB'. I have 'PicoScope Support Toolbox' and 'picotech-picosdk-ps5000a-matlab-instrument-driver-b...