Oh, so it's impossible to use it anyway then? Well, RIP.
It's not that you can't use freeShop. Many 3rd party, Virtual Console, and DSiWare games are still available to download.
Nintendo is blocking us from downloading select titles, mostly their 1st party titles. The selection of games that you can get from the CDN server will continue to dwindle as more are added to their server-side ticket validation list.
Also, don't put your 3DS to sleep mode when downloading games on firmware 11.8.0-41. There's a change in the NIM system module that'll detect if you're trying to download in sleep mode, and this can flag you for a ban.
freeShop, CIAngel, Villain3DS, WiiU USB helper, tikDevil??, FunKeyCIA, 3DNUS??, and all other CDN downloaders are dying a slow death.
If you're trying to grab a few updates, DLCs, and whatever unsecured games that are left, hurry up before the gates fully close.