Didn't know you could even renew online. The only thing I could find was this.
There is a section in this that states:
(12) (a) The licensee must renew his license on or before the expiration date by filing with the department
the renewal form, a notarized affidavit stating that the licensee remains qualified pursuant to the criteria specified
in subsection (2) and (3) of this section, and a full set of fingerprints administered by the Department of Public
Safety or the sheriff of the county of residem~e of the licensee.
The first renewal may be processed by mail and the subsequent renewal must be made in person. Thereafter
every other renewal may be processed by mail to assure that the applicant must appear in person every ten (l0)
years for the purpose of obtaining a new photograph .