That's the 8100 and the 8200i ("i" standing for infra-red channel, which the 8100 doesn't have). This is usuall followed by a couple of letters such as SE or AI that refer to which version of Silverfast is included.
I have an older model, 7500i. I'm sure you can find these cheaper second hand, and mine is in pretty good nick. Beware though of two things, if you have a Mac: (a) the versions of Silverfast are the older V6 version, which will not run on any version of MacOS after 10.6 (rely on the old built-in emulation for the previous Mac processor), and (b) the library is 32-bit, which means it will not run with the 64-bit version of Vuescan, and will not run at all after MacOS 10.14 (when 32-bit software will be banned). I don't know at this stage whether I can run it on Win 10...
I sent a couple of complaints to Plustek, and they wrote back:
"Thank you for your enquiry. Driver to Mac OS X is automatically being installed by SilverFast and not available for separate installation. Therefore we don\'t release any driver download."
"SilverFast 6 which has been originally delivered with that scanner model is compatible up to Mac OS 10.6 only (final version 6.6.2r5). In order to continue using your scanner with Mac OS 10.7 up to 10.14 an upgrade to latest SilverFast 8 is required.
"Register your copy of SilverFast 6 at <a href="
http://www.silverfast.com/">
www.silverfast.com</a> in order to receive discount on upgrade to SilverFast 8."
At this point it's not clear to me whether, if I pay the £80 or more for an upgrade to SF8, I will then be able to use Vuescan on a 64-bit system. I'm going to try installing a demo version of SF8 if they'll let me, but I did install it once before when it first came out.
IMHO having tried both, the images from the Plustek are superior to those from an Epson V500. Checkout the tests on Filmscanner.info ...
https://www.filmscanner.info/en/FilmscannerTestberichte.html