Good, you know where the drivers are.
Open a konsole, it may be called terminal. That is not a big deal as long as you have a command prompt.
Navigate to the download directory, using the change directory command. When you open a terminal, it will normally open in your users home directory. That will be /home/yourusersname/. If download is one sub-directory in, a 'cd download' will get you there.
If you want to verify file names, do a ls command. The files will be listed.
The command to install lpr driver is 'sudo dpkg -i --force-all (lpr-drivername)' Mint is a Debain derivative. So dpkg should do it. The sudo allow you to gain root privileges for one command. You will be prompted for root password; the one you set during install.
Now install the cups wrapper driver. The command is similar to the lpr driver.
'sudo dpkg -i --force-all (cupswrapper-drivername)' will do it. You have to enter the correct driver name for both lpr and cups wrapper driver.
The command 'sudo dpkg -l | grep Brother' will verify the driver got installed.
I didn't ask if you have cups installed. Before you begin, confirm cups is installed and running.
To confirm its running, run the command 'ps aux | grep cupsd' and press enter. If its running you will get some output that looks like this:
ps aux | grep cups
root 1712 0.0 0.1 52556 3344 ? Ss 08:13 0:00 /usr/sbin/cupsd -C /etc/cups/cupsd.conf
cliff 2129 0.0 0.0 6848 972 pts/0 S+ 08:32 0:00 grep cups
The first line is critical, note the user root, and the /usr/sbin/cupsd, that is the cups daemon running in the system.
If it does not show up, either cups is not installed ( most likely ) or it is not running. Check the package manager in Mint, and install if necessary. Post if you have cups problems.
You can find the instructions here -->http://welcome.solutions.brother.com...ion_prn1a.html
to install the drivers.
Once the drivers are installed, you have to configure the printer. In a web browser ( does not matter which one ) in the location bar, type http://localhost:631
and press enter. This will work if cups is running, it it is not, you will get a page not found error, and you need to get cups going.
Once you get the Cups page on the browser, there are tabs on the menu. Click on Administration. Click on Add Printer. You will get another screen to fill in. At this point you will get a series of screens to fill in. Most are straight forward. The critical(s) one will ask you the make of the printer, and then give you a list of drivers. The cups wrapper driver should be there, it may be a long list. Find it, select it. You should be done. Try a Print Test Page. It will work if everything is good.
Post your problems, with as much detail as you can manage. Remember we can not see what you are doing, so details help us.