I was sick of doing this all the time for upgrading ignition, so I created a script to do it.
#!/bin/bash
# download the latest version of ignition
echo -e "Go to this web page, and paste in the download link. \nhttps://inductiveautomation.com/downloads/ignition\n"
echo -e "Download Link: "
read httplink
nlines=$(wc -l < $httplink)
filename=`echo "$httplink" | rev | cut -d'/' -f1 | rev`
echo -e "filename: $filename \n"
echo -e "Downloading from: $httplink \n"
####### Enable when ready
wget --referer=https://inductiveautomation.com/downloads/ignition $httplink
echo -e "Making file executable.\n"
sudo chmod +x $filename
echo -e "Running Installer.\n"
./$filename