You do not need the proprietary C39t36l font. You can achieve the exact same visual and scannable result using legal, open-source Code 39 fonts .
A: Your scanner may be expecting a checksum. Generate a mod 43 check digit and append it before the closing asterisk. C39t36l Font Free Download
: Provides a completely free (freeware) version of the Code 39 True Type font that is not crippled or limited. You do not need the proprietary C39t36l font