Why do I get an error message when trying to install Windows 10 TP?

[Goldy Mazumdar]

problem installing windows 10 TP

while updating my tab says : unable to install as OS is compressed

 

[Giffdev]

Re: problem installing windows 10 TP

Hey Goldy,
if you're having problems with the Windows Tech Preview in the future, please ask on our official Microsoft forums at Answers.Microsoft.com on the Windows Insider forums.

However, your issue has come up before, and the solution is here:
Can't install Windows 10 - PC Uses a compressed operating system - Microsoft Community

​Thanks for testing Windows 10!