When I install Compiler 5 version,I click the downloads in Legacy Arm Compilers – Arm Developer，but the page will skip to Download Hub (arm.com) and dwnload don`t start.
Which version of Arm Compiler 5 do you need? As a work around, you could download an older version of Keil MDK, and copy the ARMCC folder from that into your current project.
For example, according to these release notes:
https://www.keil.com/update/relnotes/MDK537.htm
Arm Compiler 5.06 update 7 is part of the MDK version 5.36. You can download this older version from
www.keil.com/.../rvmdk.asp