I cannot install AmigaOS 3.5, it crashes during main install?
Try changing the Sound options to better level e.g. 16 bit and 44.1 Hz and change the CPU settings to adjustable and to level 1. Alternatively, edit out references to playing sounds (such as the clapping noise) in the Installer script (if you know what you are doing). There is no need to create an Emergency disk as this will not work under emulation but booting off any Workbench ADF would be sufficient to install AmigaOS 3.5 or 3.9. There is an update available for AmigaOS 3.9 called a Boing Bag and to get it to install on WinUAE you need a patch available from Amiga Inc.