The following p3d's from CUP\Terrains\cup_terrains_ca_misc\Data\sidewalks need to be replaced by the same name from CUP\Terrains\cup_terrains_winter_objects\Sidewalks

SidewalkClear.p3d
SidewalkClearLong.p3d
SidewalkClearMiddle.p3d
SidewalkClearShort.p3d
SidewalkCorner.p3d
SidewalkCrossing.p3d
SidewalkCrossingT.p3d
SidewalkShortEnd.p3d
SidewalkTurn10deg.p3d
SidewalkTurn20deg.p3d
SidewalkTurn30deg.p3d
SidewalkTurn5deg.p3d

I believe these are all of the sidewalks typically used on Chernarus