Selecting 'yes' to the question "Should this be a portable installation" in the installer results in a mangled entry in simuconf.tab, and hence a multiuser install instead.
################################portable or not#################################
#
# This simuconf.tab will be read first => we set meaningful defaults here.
#
# load/save the files in the users or the program directory directory? (default: 0 = user directory)
# ATTENTION!
# will be only used if this file is located in the program directory at consingleuser_install = 1 singleuser_install = 0
#
Fixed in r7665, thnaks