V1.3.800 Download: github. Installs the same way as SR Revised (extract the latest official version of IR into your game directory, then extract IRR's "item_rev" folder on top of it before installing anything from IR, make sure to overwrite all).
If you are on a non-Windows OS, make sure that the two folders are combined: if the "change-log.txt" file still exists in "(game directory)\item_rev\", then you should be good - if it doesn't, post in the thread for help. MacOS users can try to use