all my 'old' trees are seasonal
these are some of my 3D speedtree based seasonal trees incl but not limited to fir trees:
Roys_SLD_EL1_1-1331 3D_seasons,Roys_SLD_S1_6-1895 3D_seasons,Roys_SLD_S1_7-2091 3D_seasons. etc
Roys_deadtree_dt5-90_m5_4D_season,Roys_deadtree_dt6_m5_4D_season, etc
Roys_Aspen_osina3_m5_4D_season etc
Roys_rockmaple_klen3_m5_4D_season etc
<kuid2:122860:100229:1>,<kuid:122860:100381>,<kuid2:122860:100128:1>,<kuid:661281:75002>,<kuid2:122860:100186:2>,<kuid2:122860:100276:1>,<kuid2:122860:100278:2>,<kuid2:122860:100830:2>,<kuid:122860:100279>,<kuid:122860:100265>,<kuid:122860:100710>,<kuid2:122860:100081:2>,<kuid:122860:100913>,<kuid2:122860:100085:2>,<kuid:122860:100917>,<kuid:122860:100268>,<kuid:122860:100914>,<kuid:122860:100758>,<kuid2:122860:100665:2>,<kuid2:122860:100659:2>,<kuid2:122860:100757:1>,<kuid2:122860:100072:2>
They are built-in or in payware.