How to find the driver for the Brother 1E21 Laser Printer for SendSuite Live, SendSuite Xpress, and Ascent

Products affected: SendSuite® Live, SendSuite® Xpress, Ascent™
The correct printer driver for the 1E21 document laser printer is the Brother HL-L5100dn printer driver.

To download this driver, visit the Brother website at http://support.brother.com/g/b/downloadtop.aspx?c=us&lang=en&prod=hll5100dn_us_eu_as.
UPDATED:  December 14, 2017