MS SQL Server 2014 Developers Edition and downgrading to 2008

Hello folks,

       I am not sure how to verbalize this but here it goes:

I am using PHP 5.5, IIS 8 Express and MS SQL Server 2014  Developers Edition.
It was my understanding prior to purchasing it, that I could downgrade to MS SQL Server 2008.
When I installed MS SQL Server 2014, it did not ask me what version year i.e. 2008 etc. nor anything of the sort.
And the installation went very well.
I need to use the 2008 version for my application. How does this work?
Could someone explain this to me? And explain to me what I must do to ensure that I am using 2008?
Any help would be appreciated...
OverthereAsked:
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PadawanDBAOperational DBACommented:
You can perform a specified set of edition upgrades (look at the "SQL Server 2014 Edition Upgrade" section of this: https://msdn.microsoft.com/en-us/library/ms143393(v=sql.120).aspx).  You can only perform instance upgrades in the direction of older to newer, not newer to older (this is speaking specifically of an in place upgrade).  You can absolutely download whatever version of SQL Server 2008/2008R2 that you need, license it and then copy the data into the new 2008/2008R2 instance (a straight backup/restore will not work because the database version is already at the 2014 level and you cannot revert that to an earlier version).

Edit: Also to clarify a little more on the what you must do portion, you will have to specifically get the installation media for SQL Server 2008 or SQL Server 2008R2.  If you have an MSDN subscription, depending on the subscription, there is a good chance that the installation media will be there.
Vitor MontalvãoMSSQL Senior EngineerCommented:
Why do you need SQL Server 2008? What is the issue if you go with SQL Server 2014?
You can always use a database in MSSQL 2014 that is compatible with MSSQL 2008. You'll only need to change the database compatibility level for the one you desire.

Another option is to install SQL Server 2008 and perform a side by side migration. You can use Copy Database Wizard. The link is from an article that I wrote about how to work with it.

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