I possess the authentic technical documentation of Directory Hub Listing & Business Directory CMS, obtained prior to the seller lduruo10 (lduruo10's profile on CodeCanyon) from Ukraine becoming unavailable.
Not sure if it’s temporary or permanent but there’s no item listed on the author account.
You should contact the author via the form and try to get some support first. If you still can’t, there’s not much things to do but you could try to contact Envato support