Hello, i have the old version of the standalone wallet (not the lightwallet, the one that you open with Chrome) and i want to install the new version 0.6.84 and it comes in a .tar files, i opened that files but it comes with a bunch of files and folders, i thought it was going to be a installer or something.
I’m using a MAC computer, thanks in advance.
Hello.
I also use the standalone version (NIS /NCC) on Linux.
I can tell you how I do this so maybe you can do the same.
1st I download the tgz file.
Then I unpack the tgz file which unpacks to folder named “package”.
Then I rename the “package” folder into “NEM” .
Then copy or move this into my user directory.
Then go I terminal to /home/{user}/NEM/
Then start nis by typing “./nix.runNis.sh” in the commandline.
Then start ncc by typing “./nix.runNcc.sh” in the commandline.
then go to browser and enter
http://127.0.0.1:8989/
I think this should work for you as well.
IMPORTANT:
before you do any update or change is wise that you make a copy of your wallet and address file if you have it on your system.
This files are usually in
/home/{user}/nem/ncc
on unix like systems ending with
*.wlt and *.adb exstensions
Also it good to keep your private key safe somewhere safe on paper
or any other storage medium not connected to the internet 
I hope you manage.
Bye.
You may want to export your account to nanowallet, it will be easier to download and upgrade the nanowallet.