The Butel ARC 536 PRO isn’t any more or less difficult to use than Sentinel or ProScan, at least as far as the automatic download is concerned. But you state you are trying to programming the scanner MANUALLY, using Butel ARC 536 PRO. It’s doable but it is not recommended, as the many settings needed for a trunked system cause us imperfect humans to “fat finger” an entry or two and foul up the process, resulting in failure. It’s tedious work susceptible of making mistakes. (Not to mention it would take you a month of Sundays to program a bunch of trunked systems!) So, if you want to use Butel ARC, get the RR premium membership.
However,
As suggested, using Sentinel is the way to go, you don’t need a RR subscription, but if you want to use Butel, and the auto download feature, you need a RR subscription.
(Its recommended to donate in the form of acquiring a RR premium membership as a way of supporting the database, which is free to all... it’s the auto download feature that costs. I donate in this manner and enjoy using Butel ARC and ProScan’s automatic downloads as I own both aftermarket programs… and support the database at the same time.)
The history behind these auto downloads is precisely related to what you are trying to accomplish when you manually program your scanner. It’s an almost impossible task when considering the many parameters a trunked system needs to see set correctly In your scanner. The scanner manufacturers knew this, the average consumer isn’t inclined to take on such a task, they were going to make mistakes, and sales would suffer. Enter Radio Reference. In conjunction with Uniden they took their free database and created the ability to let your computer/laptop do the heavy lifting when it comes to programming a scanner. And they did it by including within Sentinel (the Uniden software programming tool) the ability to do the auto downloads. You just choose what comms systems you want and download them into Sentinel, and then from Sentinel, download into the scanner. (Butel and ProScan added the auto download ability to their aftermarket software too, but at a cost.