Here is a link to the latest version of the tool (1.80.0.160.0 Beta).
ARM
Download and unzip. You need the tool and 5 dependencies that are bundled in a sub-folder.
After downloading and unzipping, connect your Lumia to a PC via USB. (Or transfer the file by another method if you prefer.)
- Navigate to the root folder of the device and place the ARM folder there.
- On the device go to Settings > Update & Security > For developers > highlight "Developer mode" by tapping on it > accept the warning and tap "Yes." (Note that you may want to come back after the tool is installed and restore your default.)
- Close Settings and open File Explorer
- Navigate to the root folder of the device and open the ARM folder > open the ARM Dependencies folder > tap on each file in turn and tap "install" for each when the dialog box pops up (there are 5 dependencies in total and you should install all 5)
- Navigate back up the directory tree to the ARM folder > tap on the tool > accept the advice and tap "install." (Note that the tool should be signed in the advice by "gus33000" and if it is not I don't know what the heck you are doing - get out of there!!!)
- The App should appear on your All Apps list and you may pin it to Start