sharing unlisted play retailer sport with a good friend

so final 12 months i put in stickman ragdoll playground on my telephone, and after seeing me play it, my good friend desires to obtain it too. i observed it stopped enjoying adverts some time in the past, and it doesnt present up if i search for it on the play retailer on any of our telephones. the one means i can entry the sport web page is by clicking on the sport as soon as i discover it on the put in apps part of the play retailer. upon seeing the web page for the primary time shortly, i attempted to share it with him by way of the three dot factor within the higher proper nook however it simply stated "merchandise not discovered". what am i able to do for him to have the ability to obtain SRP?

edit: hyperlink is