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Monday is the easiest, Sunday the hardest. Mon–Tue: find a value in memory. Wed–Thu: find it, then patch the code that changes it. Fri–Sun: crackme's. New to this? Try the tutorial first.
HINT 1 free
HINT 2 free
HINT 3 free
A shareware check from the days when 'registered' meant a number on a sticky note.
It adds the two halves of your serial together and wants a particular total. You could work out a serial that fits - but you are allowed to edit the routine, so why would you?
Any patch that ends with eax = 1 is accepted.