
Start by extracting the file "Concert_Strings_2.part01.rar". That will install Concert Strings 2.
Then extract the file "Concert_Strings_3.part01.rar". That will install Concert Strings 3.
Then extract the file "Concert_Strings_Legacy.part01.rar". That will install Concert Strings Legacy.
Extract the Concert Strings 3 Instruments 1.4 Update file and put the resulting folder into your Concert Strings 3 folder.