ArtRage 3 Studio Pro and Artrage 4 were both available for purchase via Steam. Later versions are not available for purchase on that platform but you can still download your older software from your Steam Library.
Upgrading to Later Versions.
We provide upgrade discounts for customers who purchased ArtRage 3 Studio Pro or ArtRage 4 on Steam who want to upgrade to the current version of the product. If you own a Steam version you can claim your Upgrade Discount by following the standard steps for upgrading, which can be found here: Updating ArtRage, or Upgrading to a Newer Version of ArtRage
Note that you will need your ArtRage Serial Number which can be located by selecting the ‘CD Key’ option to the right of the ArtRage page in your Steam Library.
Running ArtRage 4 for Steam on Windows XP.
ArtRage version 4.5 is not compatible with Windows XP but an older version of ArtRage 4 is available in the Beta branch of the product’s entry in your Steam Library. Right click on the ArtRage entry in your library list and select Properties, select the ‘Betas’ tab in the Properties window and choose the ‘XP Compatible’ entry from the beta opt in popup.
Once you have done that the older Windows XP compatible version will be downloaded.