We're using LightSpeed 2019.3.1 at the moment in our store. Will it also run on macOS Big Sur?
As of right now we are testing Lightspeed Onsite 2019 3.1's compatibility and functioning with the new Mac OS X; Big Sur.
We will be releasing a new version in the fall specifically for this MaC Compatibility.
I would recommend that you do not upgrade to the new OS X until we release the specified compatibility version.
Technical Support, Onsite