Neither scanner comes with any "stock" software for programming. The PSR-500 has a program, on the cd-rom, for data backup, I believe, but that's it. Not sure if the Pro-106 has that. Radio Shack does have a program where you get a trial version of ARC-500, with a limited number of uses, along with a trial membership to Radio Reference, when you buy the programming cable from them, but both the cable and ac adapter are extra cost options. Both are included with the PSR-500.
For software, the three main choices are Win500, PSREdit500, and ARC500. More details can be found
here. All three do have a thirty day free trial period, before you have to either go ahead and purchase a license for the software, or it will quit functioning. I would suggest trying all three. You may find you like one more than the others, or that it's interface is easier for you to grasp. All will program your scanner. A premium
subscription will make that much easier, but is not required.
There is a user developed online
guide for Win500. The user guide for ARC500 can be found in the Wiki
here on RadioReference. PSREdit500 has a built-in help file. The authors of all three programs often answer questions direct in threads posted in the software forum. You might also check down in the Arkansas state forum, for other users near you. One of them may be able to provide a file, from one of these programs, to give you a "jump start" to get up & scanning, as you begin to learn the new scanner.