EV9 FSA Agent - Install Failure - ISSCRIPT
I have upgraded an EV7.5 installation to EV8SP5, both FSA and Exchange. There are 5 file servers involved in the FSA configuration, and I upgraded the FSA agent on one server only. This was due to a reboot being required following upgrade - and as I was upgrading to EV9 shortly after I decided to leave the other 4 servers. All worked fine with the one I upgraded and rebooted.
Following the EV9 upgrade I attempted to upgrade the remaining 4 file servers from the 7.5 FSA AGent to EV9SP3 FSA Agent. ALL of the 4 servers failed the upgrade with the same error. I tried both install from with the VAC and also a local install on each file server - same results - each failed and rolled back. The message I am seeing in EV Installation Log is near the end, and is as follows:
ISSCRIPT_VERSION_MISSING = The InstallScript engine is missing from this machine. If available, please run ISScript.msi, or contact your support personnel for further assistance.
I see many references to this message regarding installations of various software products, but nothing relevant for EV. I didn't try to install EV8SP5 on these remaining 4 servers, would that of worked ? Is it an issue with installing EV9SP3 FSA Agent over the EV7.5 agent, it seems strange that the one I picked at random for the EV8SP5 upgrade wotked OK.
Any advice welcome.