BEFORE YOU USE MTGA PATHWAY, BE SURE TO ENABLE DETAILED LOGGING IN MAGIC ARENA. You can accomplish this in Settings -> View Account -> Enable Detailed Logs
You will be taken to Github so you can download the LATEST and TRUSTED version of the application. NOTE: The source code is also available for inspection.
Depending on your local Windows enviornment, antivirus, or filewall, you may be prevented from installing the application. Give MTGA Pathway any permissions it may need to run.
Once the application starts, your collection should automatically be recorded and ready to use!
MTGA Pathway assumes that you have Magic Arena installed in your C: Drive (for Windows users). If you have the game installed elsewhere, you may be prompted to find the game's log file on your computer manually.
Troubleshooting
If you notice the application is not updating new cards or is being inconsistent with your collection in Magic Arena, you can delete the Settings.txt file from your \AppData\Roaming\MTGA Pathway\ folder.
If you are having problems with decks not showing up on the page, you can open the developer tools and clear the local storage. Click on View > Toggle Developer Tools > click the application tab > drop down Local Storage > click the url that appears > hit the clear all icon that appears above the Key/Value pairs, or delete them individually.
Double check that your antivirus or firewall is not preventing you from running the application. Add an exception if needed.
When in doubt: uninstall MTGA Pathway, restart your computer, redownload the application, and follow the Getting Started instructions again.