"12" is a "base 10" number. The error codes in TurboActivate.h are in hexadecimal. So if you type "12 to hexadecimal" in google you'll see the hex number is 0xC. Then, look in TurboActivate.h:
/* MessageId: TA_E_TRIAL_EUSED
MessageText:
The trial extension has already been used.*/#define TA_E_TRIAL_EUSED ((HRESULT)0x0000000CL)