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I have exactly the same error. I'm trying to upgrade Plesk 9.5.4 on a centos 5.x (64-bits) server to the latest Plesk 11.5.30 and it results in the following:
ERROR: An internal error occured in auto-installer, rev.324981 AiComponent.cpp, line 335.
I receive this error on 5 different servers. I tried to upgrade with the latest plesk-installer as well as the following installers:
When I select to upgrade to plesk 11.0.9, the auto-installer does not give this error and I'm able to upgrade to 11.0.9, but I prefer to upgrade to the latest version, 11.5.30.