copy BOTH files to Interface/addons, cuz if u copu just the chainrule file to interface/addon dont work 

http://www.curse.com/downloads/details/12924/

GridStatusChainRule
provides two custom indicators for Grid raid frames. The first
indicator colors the frames based on which rank of Chain Heal (if any)
will be 80% efficient or more on the target. This indicator is meant to
cut down on overheal. The second indicator colors the frames based on
how many Chain Heal jumps are possible from each target (from 0 to 2).
This indicator is meant to prevent wasted Chain Heals on targets that
won't jump.

The default setting for the first ("Targetting") indicator uses
Green for Chain Heal (Rank 1), Yellow for Rank 4, and Red for Rank 5.
The default setting for the second ("Density") indicator uses no color
for less than 1 jump, yellow for 1 jump, and green for more than 1
jump.

GridStatusChainRule relies on information supplied by a helper addon
(ChainRuleHelper) because of the way Blizzard handles position
information in instances. "Each member of the raid must have the addon
installed to report who is within Chain Heal jump distance of them. Any
player without the helper addon will have no ChainRule indicators
applied to their raid frame. This is unfortunately the only way to
supply this info. But, the helper addon is extremely lightweight and a
one time download so as to be as small of a burden as possible. Ask
your guildmates nicely to help you out =)."

Updates in v0.1.1:

• ChainRuleHelper now works in Raid, Battleground, and Party settings.
• Indicators are now properly removed on death.
• New color settings have been added, and both new and old settings now work.
• Efficiency level for the targeting indicator is now configurable through the Grid UI

Please note that this addon is in early development and is not
guaranteed to be totally bug free. Please post any bugs you encounter.
The currently known bugs are:

• Resetting the addon options will cause the event handling to be thrown off.