Download resource.zip and extract it such that the resource folder resides in <steam>/steamapps/common/Half-Life/dod_addon/

If the dod_addon folder does not exist then you should create it. You may need to enable this folder in Options > Video > Allow custom addon content

Download customxhair.spr and save it in <steam>/steamapps/common/Half-Life/dod_addon/sprites

If the dod_addon folder does not exist then you should create it. You may need to enable this folder in Options > Video > Allow custom addon content

You can cycle through the crosshairs with a bind script similar to this:

	alias xhair1 "cl_xhair_style 0; alias xhair xhair2"
	alias xhair2 "cl_xhair_style 2; alias xhair xhair3"
	alias xhair3 "cl_xhair_style 3; alias xhair xhair4"
	alias xhair4 "cl_xhair_style 6; alias xhair xhair5"
	alias xhair5 "cl_xhair_style 7; alias xhair xhair6"
	alias xhair6 "cl_xhair_style 14; alias xhair xhair7"
	alias xhair7 "cl_xhair_style 15; alias xhair xhair1"
	alias xhair xhair7

You can add or remove crosshairs from the cycle or change the order as needed. Then, simply bind a key to xhair