I bought lightroom 4 in march'14 and i was using it in pc now i want to install it in mac but it doesn't accept my serial number what can i do

i bought lightroom 4 in march'14, i was using it in pc but now i have mac and it doesn't accept the serial number. What can i do

Make sure you are using the correct serial number starting 1160 (24 digits comprising all numbers and no letters)
If in doubt you can check from your PC version. Launch LR and from the menu click:
Help >> System Info

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