Trying v1.10.2-1.7.409 with forge 1.10.2-12.18.3.2221 and then forge 1.10.2-12.18.3.2254, and in both instances get a crash msg saying it needs 12.18.3.2239 or above. 2254 is above 2239.

NM, NM - installed forge 2254 but didn't tell the launcher to use it :( Entirely my fault.