Just a heads up here folks.
The OP (that's you, Chris, the Original Poster) already has a Live GParted at his fingertips, namely on his USB Live install stick for his Linux Mint 19.1 'Tessa' Cinnamon.
So there is no need to download it from GParted's site, although that being said, it is always handy to have the standalone GParted (and labelled) , where Distro sticks can be overwritten and reused once an install is successful.
Chris also has two (2) other recent and current Threads
HERE and
HERE ... that explain his circumstances. Be warned the wifi one is 3 pages long, but now hopefully resolved (eh, Chris?

)
Wizard