What is the size of Windows 10 preview for the Lumia 640?

[Windows Central Question]

what is size of windows 10 preview for lumia 640

my lumia 640 is currently on 8.1 denim, so if i update it using that insider preview thing , what will be the size of the upgrade , many thanks in advance

 

[T Moore]

You should have at lease 1.5GB free phone memory, more would probably help, and a working SD card installed

 

[xandros9]

and you're probably looking at downloading a few hundred megabytes to a gigabyte or so.