"FSrealWX lite" is not supported anymore but the current "FSrealWX v2 2.04.0854" also works as unregistered freeware. It's not as good as FSXWX - it doesn't have direct wind control if you dont buy the license and winds aloft do not match as good to winds from SimBrief's flight plans as those from FSXWX. You must first register to download.
Server www.plane-pics.de is still responding if you ping it with "ping www.plane-pics.de" from CMD window. So yeah, the situation sucks, but let's hope for the best.
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Did you run FSrealWX as administrator (right mouse button and "Run as administrator")? I think it didn't work otherwise, or was it some other program, i'm not sure, haven't been using it for a while..