The launcher is not the problem - it’s that the native client can not support 10.13. We were unable to support 10.13 with the move to a native client, unfortunately.
We support 10.14, 10.15, all Big Sur releases 11.(1 to 6), and shortly version 12 (Monterey).
macOS moves quite fast with releases, so there are going to be unfortunate situations where we can’t support every previous version when targetting new ones.
If you are unable to update to play due to this, please contact Customer Support,