Help. Windows 10 Update Error on Nokia Lumia 520. What can I do?

[Windows Central Question]

Help. Windows 10 Update Error on Nokia Lumia 520.

Hi.
Today (11.04.2015) i see on this site the windows 10 developer preview is available* for my phone (Nokia Lumia 520). After microsoft fix the server error i try to update my phone to "fast ring" preview. After i check for update's and download it. Here is the problem, Preapare to update 98% after go to 58%~ to 99% to 59%~ to 100% to 60%~. After say this: "The update was downloaded, but couldn"t be opened. (800700d)". I try this: -Redownload and prepare install -Reboot phone -Delete apps and internet explorer history (After i have 2.5 GB 'free') -Charge and download, prepare install -Very good conection (3G and Wifi conection) (i not try reset but i think that dosn't work). But that dosn't work. I wait that update and now a error... Someone please help me. Sorry about my english.... Thanks anticipated for spend time for read that question

More information:
Phone: Nokia Lumia 520
Os version 8.10.14219.341
Firmware revision number: 3058.50000.1425.0006
Buy from: Orange Shop*