Mac apps will complain they "Can't be opened" likewise "Permission denied" via running the executable under Terminal when the *.app/Contents/MacOS/executable doesn't have the execution permission set. You can try out my post about a helper script that fixes both permissions and removes the extended attribute com.apple.quarantine from these new apps which means it can open as soon as possible or take the manual approach (you shouldn't need to do the jre part for the current build meaning step 5 and after you can ignore)