In order to install Enterprise Manager 10g Grid Control Release 4, you must install 10.2.0.3.0 Grid Control and then upgrade it to 10.2.0.4 version

The 10.2.0.3 Grid control software can be downloaded from -
http://www.oracle.com/technology/software/products/oem/index.html    

可以看到 102030 的Grid Control 软件名称中有一个 full  字样， 是安装的基础版本 。升级到 10g 其他版本之前，

必须先安装这个版本 。  因为 102050 版本的patch 已经出来了， 所以一般我们升级到 102050 .  

Oracle Enterprise Manager 10g Grid Control Release 3 (10.2.0.3)
for Linux x86-64   Download the complete files  

Linux_x86_64_Grid_Control_full_102030_disk1.zip (1,384,327,274 bytes) (cksum - 558327817)  

Linux_x86_64_Grid_Control_full_102030_disk2.zip (806,746,437 bytes) (cksum - 4081629577)

Download the complete files  

gc_x86_64_10205_part1of2.zip (1,138,415,755 bytes) (cksum - 664237049)  

gc_x86_64_10205_part2of2.zip (1,137,978,042 bytes) (cksum - 332462414)

下载地址： 

http://www.oracle.com/technetwork/oem/grid-control/downloads/linuxx8664soft-085949.html