HeatSink, end of discussion
Forgot to mention one thing. Also get the
LibInternalCooldowns-1.0 and do following:
1) Unzip HeatSink to your Addons folder, locate LibInternalCooldowns-1.0 folder inside it and delete everything in there leaving folder itself intact.
2) Unzip downloaded LibInternalCooldowns-1.0.zip, locate LibInternalCooldowns-1.0 folder inside it (should contian files Data.lua, LibInternalCooldowns-1.0.lua and lib.xml) and copy these files to the LibInternalCooldowns-1.0 folder inside your HeatSink addon's folder.
3a) Profit.
3b) If you're lazy or not OK with PC stuff, you can get already updated version here
<link removed - see below> and profit even more. Feel free to check for viruses, but I'm pretty sure I'm clean.