elrs.lua works with all versions of ExpressLRS from v2.0 to current. There is no requirement to use an e.g. elrsV3.lua for 3.x, just use elrs.lua.
When copying the lua to you handset, delete any old versions such as ELRS.lua, elrsV2.lua, or elrsV3.lua. The version-labeled filenames have been obsoleted.
Click the file link above, find the "Raw" button near the top of that page. Right-click, Save link as.., copy the .lua file into the /SCRIPTS/TOOLS directory of the SD card on your handset.
Use the button shown in the image below to download the .lua script into the /SCRIPTS/TOOLS directory of the SD card on your handset.
