I found that early on too. The InstallerNG just never works, it always locks up after clicking through to the install process.
Thanks to SkulleateR's suggestion in an earlier thread a while ago, I got this one from aminet and copied the installer file into the C directory (I renamed the installer in there to installer_bak instead of overwriting it though, just in case). Works perfectly now.
https://aminet.net/package/util/misc/Installer-43_3
