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Date: Sat, 04 Oct 2014 15:52:38 +0200
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To: Maurizio Vairani <maurizio.vairani@cloverinformatica.it>, 
 User Questions <freebsd-questions@freebsd.org>
Subject: Re: Downgrade a pkg
References: <542E6E3F.9040405@cloverinformatica.it>
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On 03.10.2014 11:37, Maurizio Vairani wrote:
> Hello,
>
> I need to downgrade VirtualBox to version 4.3.12_1.
> How can I do it ?
>
> Thanks in advance,
> Maurizio
>
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In the past was portdowngrade used for such things.
http://cipitunk.wordpress.com/2012/01/16/ports-downgrade-in-freebsd/

It is in ports under ports-mgmt.

Hope it is working.