Yes the download is safe i play dayz all the time and nothing is wrong with my computer.
yes the aether mod is safe with avast
Mod Loader is the only mod that will allow your client to run more than one mod at once. It is very safe!
you can transfer them to usb then use a modio or horizon which has a built in usb explorer
Yes.
Yes, Game Maker is safe and will not harm your computer in any way. Game Maker is a great way to start making computer games and release them on the internet.
It is very safe. It works, and has no virus.
yes
No.
it has to be on computer
Yes
You can mod halo 2 on the computer by enabling some mods downloaded from halomaps.org, or you can make your own using those tools.