What are my chances of finding a new divisor?
Not bad. If you persist in running the program, you should find a new divisor. The author of the program has found 4 new divisors in 9 months of testing. Other participants doing testing for divisors have also been fortunate. It is likely that 5-10 new divisors will be discovered each year. The difficulty of finding new divisors will grow logarithmically with time, but so is the speed of modern computers.