CBQE-1069: fix windows upgrade from 1.8.0 version

Change-Id: I67b1c6db8c748babc3e08de57365921d5305b10d
Reviewed-on: http://review.couchbase.org/25080
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>