To install:
Copy the "gui" folder into "res_mod\" folder inside game directory.

Do not use it with different version.
e.g.:
Mod version 1.18.0+ should work with version 1.18.0.0, 1.18.1.0, etc.
Might break if you put 1.18.0+ in 1.19.0.0, if they changed any of the file(s) listed in uninstall section.

To uninstall the mod, remove these files:
res_mod\\gui\flash\
arcadeCrosshair.swf
crosshairControls.swf
gfxfontlib.swf
postmortemCrosshair.swf
sniperCrosshair.swf
strategicCrosshair.swf