Fyrst_Igor - if you try multiple times it eventually works. Somethings going on with the mirrow, but I saw that issue too. Just try downloading again until it works. It took me a 3 or 4 tries.
go here: http://ci.micdoodle8.com/job/Galacticraft/958/
add those jars to your mods folder, lowercase the filenames, remove any galacticraft/micdoodle build 955 jars, and it works.
Looks like one of the galacticraft jars is missing in the new one. The diff between old and new shows that galacticraft-1.6.4-* was removed in the new zip. galacticraft-planets-* is still there.
Which in my opinion is the right choice because that mod is nothing but bugs piled on errors mixed with redundancies.