An ISO file is an image of a CD - thus to install it on your computer you must first write it onto a CD so you computer can read it.
Some SIR products are available to purchase and download in this format. Any products which come in this format will clearly say so on the product page.
In order to do install them once downloaded, you should be able to use whatever existing CD writer software is on your computer. You will typically insert a blank CD, open the relevant writer program and then select the relevant ISO file - it will then be burnt onto the CD at which point you will be able to read the file and install it.
If you do not think that your CD burning software can burn ISO files (this is only likely to be a problem if it is somewhat outdated), then there are various freeware alternatives available on the internet (e.g. ISO Recorder).
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