Hello @Javier Huerta,
Welcome to Microsoft Q&A forum.
You can download VS 2008 from here: Downloads - VS 2008.
Some versions of VS 2008 may be needed to be activated by using product key or Visual Studio subscription license. Since VS 2008 is a very old version of Visual Studio, for non-express versions of VS 2008, you may check if it was still sold(retail), or consider using VS subscription license to activate it.
Sincerely,
Tianyu
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