How can I install new software on my BB Z10?

I dont see any automatic updates on my Z10. Is there any way to update 10.3 manually?

yes check the leak section. In the stickies are detailed instructions. Super easy

If you still aren't clear or need additional help just post back here

Your Z10 won't receive 10.3, but will receive 10.3.1 when it launches officially.

Take a look at the first part of this article. From the Editor's Desk: Classic, 10.3.1, CES, MWC and more! | CrackBerry.com
February is the earliest we can expect the official roll-out, based on current info.

Or you can load the latest OS that has been "leaked" from the BlackBerry servers and try it out.

Here are instructions for loading an OS using an auto loader:
http://forums.crackberry.com/showthread.php?t=927076

You can find the latest OS here
http://forums.crackberry.com/showthread.php?t=986752

But you may want to read through the "findings and fixes" thread to see what other users are reporting. Not all devices have the same results. For example my Z30 and most others have zero issues on this OS but others have reported missing text messages.

http://forums.crackberry.com/showthread.php?t=986772

And again if you have any problems you can always get great help there or here.

Or you can do as Elessar suggested and wait for an official OS from your carrier.

Z30 & Q10
Can't imagine life w/o Blackberry