Executable AR

Hi, currently using the latest version of Lubuntu an old laptop - Dell Studio 15 (32 bit of course!). Have installed the latest version of Wine from the repository. Trying to download/instal Runescape 3 (not old school) from the Lutris website. Get past the stage of selecting the destination when a pop-up box appears and says “Unable to find executable AR” and I can go no further. Do I need another file? Any other suggestions.