You can install V5R4 iSeries™ Access for Web on V5R3 and later releases of i5/OS™.
If you are using an earlier release of the server, see "Install, upgrade, or delete i5/OS and related software" for instructions on upgrading your server to a supported release. If you need to install a new release of i5/OS, install the new release before installing iSeries Access for Web.
Note: 
In order to install the iSeries server, your profile needs the
correct special authorities. You need to have these special authorities: *ALLOBJ,
*IOSYSCFG, *JOBCTL, *SECADM. This security level is required for installation
and configuration only, not for regular use of iSeries Access for Web.
In order to install the iSeries server, your profile needs the
correct special authorities. You need to have these special authorities: *ALLOBJ,
*IOSYSCFG, *JOBCTL, *SECADM. This security level is required for installation
and configuration only, not for regular use of iSeries Access for Web.