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I have designed a circuit using a Picaxe18X to display 3 digits of data on 7-segment LEDs using the Cmos 4553 3-digit counter as the LED interface. When simulating - the error "DSIM model CMOS.DLL failed to authorise - Product key not found" occurs and simulation is aborted.

When attempting to do a 'readadc/readadc10' from port 7 the simulator gives "access violation in module AXEVSM.DLL" message. Also with port3 not connected and reading port2 the error message "Vin not connected to an analog net-results will be invalid" U1ADC3 appears and with port2 not...