Fix scripts error

[Sianglife]

1.Fixed download.sh cannot download zip data by using wget.

[alexVinarskis]

Can confirm that fix to download script works (unlike og one), thanks!

Regarding "remove unused utilities", perhaps worth adding to README, that since local iasl is removed, it needs to be install on host system, brew install --cask maciasl for mac, or sudo apt-get install iasl for linux

[xick]

Thanks can confirm it's working, however needs to pointed out wget it's not installed nor in windows or mac os.
Btw sometimes scripts fails to download all zips, claiming 'missing url' but in fact I think it's a denied request from github for too many requests. We could include an option to put an api key, or add a wait between downloads could be acceptable