There is no guidance for providing support for procuring apps to be delivered via Intune; customers will need to work directly with the vendor. For Microsoft apps, such as HEVC, we made these available in VLSC. So your customer can get them from there. For Adobe, they can work with a reseller or with Adobe. Some ISVs (independent software vendors) have decided to make the app free to download, but tied a subscription service to the app (think Office or XBOX). Customer needs to work with the ISV for their recommended practice.