In fact, it is very good, l_cc_p_ *. Tar.gz is Intel C Compiler for Linux L_FC_P_ *. Tar.gz is Intel Fortran Compiler for Linux W_CC [x] _ *. EXE is Intel C Compiler for Windows W_FC [P] _ * What is the difference between Intel Fortran Compiler for Windwos but w_ccx_pu_8.1.024.exe and w_ccx_p_8.1.022.exe I don't know, I only know a version than another. The download version number is the highest. After I wrote INTEL, they really reply very quickly, saying that they just checked the documents, no problem. Then gave me a few downloaded opinions, the service attitude is good. However, when I saw this letter, I have solved this problem. I don't know why their FTP service does not support multi-threaded downloads.