When it comes C=0 sampling plans, 1factory allows both the 4th & 5th Edition of the Zero Acceptance Number Sampling Plans.
To use the 5th edition sampling rules simply start out by typing C=0 and choose your AQL.
To use the 4th edition sampling rules simply start out by typing ORIG C=0 and choose your AQL.
Per the American Society for Quality (ASQ), "Unless specified by contract, or otherwise, the c=0 plans are flexible and the fourth edition table can be used if this better suits your needs".