Hello Gents and Lassies. Is there a workaround for this issue:I installed my initial Windows 10 Tech Preview 9926 to a WD 1TB USB External Drive using WinToUSB v2.2. Although the damn thing was slow, I was still able to test it on my SonyVAIO VPCF136FM/B Quad Core 1.7Ghz 8Gb Memory USB 3.0. I was able to download the 10041 ESD Update but it would always give an error 0x80020471 something (not sure) and flashes the "Try Again" button every time. Anyways, after a thousand retries, decided to convert the 10041 ESD file to an ISO using the wonderful instructions found here at MDL! But when tried to update with the ISO it gave the finger and said that "Updating Windows 10 Tech Preview installed on an External drive is not allowed" BS! Anybody found a way around this. Appreciate all the help. I may end up doing a clean install using WinToUSB but that would mean that would have install all my software all over again.