How does someone download software to their computer?
Software can be downloaded to a computer in a couple of ways. First, it is important to know if the software is reputable and safe. One should never download unverified software. Once verified, a user can simply click on an icon for download or install using a DVD and follow the prompts based on one's preferences. Most software has recommended settings for those who are unsure about the specific settings.
Once you purchased computer software are you free to download as often and to as many computers as you want-?
iTunes does not mess up your computer. The only way it would is if you were to download iTunes from an untrusted website, if you were to download the software from PirateBay (if you were that crazy) someone could shove a virus in it. As long as you download iTunes from the official Apple website it will not mess up your computer. Hope this helps.
Once you purchased computer software are you free to download as often and to as many computers as you want?
Of course. When you download an antivirus software, you really download the installer of that antivirus not the program. When you double-click on it for install, only then the antivirus program will be "personalized" for that computer, and after that it can't be copied to another computer. When a software is installed some files will be copied in system's folder not only in that software folder.