install.package tseries

I have not been successfull in downloading tseries package in the R  
in my macbook air.

The message sent is:Error in dyn.load(file, DLLpath = DLLpath, ...) :
 imposs?vel carregar objeto compartilhado '/Library/Frameworks/

If you upgraded to 2.14 before 2011-11-10, then you should upgrade  
again (as has been advised several times, both on this list and the  
Mac-SIG list.)  If that doesn't work then read the Posting Guide for  
what is considered a minimal problem report.

Do you have any clue?

Only when you give sufficient evidence.
**************

PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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David Winsemius, MD
West Hartford, CT