FreeFile Sync Installation
 

Good day to all. I downloaded FreeFileSync_8.9_Ubuntu_16.10_64-bit.tar.gz to install in Mint 18.1. Could someone please tell me the commands?

The commands for WHAT??? You downloaded a .tar.gz file...did you try uncompressing that file, and reading the instructions? Putting "freefilesync installation" into Google, and reading the VERY FIRST HIT??:
https://www.linuxbabe.com/ubuntu/ins...c-ubuntu-16-04

You've posted several threads like this; again, read the "Question Guidelines" link in my posting signature.