Do you have a J:/BlitzMax/lib folder and does it include the file ws2_32.a?
Also contrary to the current wording in the Product updates section the 1.20 update needs to be applied to the 1.18 BlitzMax core install.
Also contrary to the current wording in the Product updates section the 1.20 update needs to be applied to the 1.18 BlitzMax core install.