INSTALL job completed rc=00 however the INST**** members weren't populated into the SAMPCJL library.
Access is restricted to Internal reader. The INST**** members are not populated into the SMAPJCL library because SYSPUNCH DD submits jobs to the Internal Reader i.e. INTRDR.
Many site have restricted access for Internal Reader(INTRDR). If so, the SYSLOG should show error messages related to the internal reader(INTRDR).
To circumvent this situation. Copy INSTALL JCL then modify copy by replacing the SYSPUNCH DD with the below one, and submit.
//SYSPUNCH DD DISP=MOD,DSN=yourHLQ.SAMPJCL(INST0000)