Why am I unable to install Windows 10 Insider Preview in my Nokia Lumia 530 Dual SIM?

[Windows Central Question]

Hey there! What happened is this: I downloaded the update onto my SD card(32gb) without any problems using OTA on my phone. But, when it restarts in order to install the downloaded update, I get back to my Windows 8.1 Update 2, and there's an error saying that the system tried to install the update from the card, but it couldn't. Can anyone help me with this?

 

[Harrie-S]

Because W10TP does not support the install from a SD card yet ( butyou download an update to a SD card).
So if you want to install the W10 TP you can not use your SD card.
This function will however be included in W10 but we do not know when.

 

[Aneesh Samudrala]

But, Harrie-S, my friend download the initial release of WP10 TP on his Lumia 535 via OTA, and he's getting regular updates via OTA. How's it possible?
Secondly, how else can I install WP10 TP into my phone?

 

[Harrie-S]

OTA is not the problem please see below.
Windows 10 Technical preview update fails because of error 801882c1 - Microsoft Community