andregarzia at openlink.com.br writes:

> sorry, i am new to smalltalk

Greetings and be welcome.

>  but i like testing alpha softwares, 

Then you must already know that alpha software is young, still
learning how to behave. It may, in its learning process, mistreat
you. You have been warned. :-)

> how do i upgrade?

This is explained on the Squeak Alpha Testing page of the swiki
http://minnow.cc.gatech.edu/squeak/982. (Those instructions are for
upgrading 2.6 to 2.7a, but I suspect you will figure out how to use
them to upgrade 2.7 to 2.8alpha.) If you don't know how to update yet,
read the note at the bottom of the download page,
http://minnow.cc.gatech.edu/squeak/388. If these pages don't make
sense to you, let us know.

-- 
Stan