Cannot open spreadsheets in latest Numbers app - "Unknown Developer"!

Having tried very hard to keep using the iWork '09 versions of Numbers ( and Pages and Keynote),  I finally gave in and am now running a large and important spreadsheet in numbers 3.2 ( or whatever the latest version is). But now, every time I need to open this and other spreadsheets I get the the "Unknown Developer" message + "you need to use a more recent version"...!  Talk about adding insult to injury. 
Can anybody advise on a, successfully running the new Numbers app and b,  even better, reverting to  the '09 version (I still have these on my mac)..
Many thanks. Giorni

Dear Ian,
Many thanks for this.  I was doing something similar for a while.  Now my concern is that once the new Numbers app has forced itself on me, and most of my spreadsheets updated to the new version, will it be impossible to roll them back?  even though I have the old apps still. Will experiment .
Many thanks,
Giorni
Robin
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Subject:  https://discussions.apple.com/Numbers for Mac - Re: Cannot open spreadsheets in latest Numbers app - "Unknown Developer"! [9yx2d-7cle-fkmx2]
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Re: Cannot open spreadsheets in latest Numbers app - "Unknown Developer"!
created by Yellowbox in Numbers for Mac - View the full discussion
This solved my question  This helped me
Hi Giorni,
Wayne Contello has written a User Tip for working with the old and new versions of iWork.
https://discussions.apple.com/docs/DOC-6991
The trick is to drag icons for both versions to your Dock. Right click or control click on each and Options > Keep in Dock. That puts you in charge of which version you launch.
Here is a screen shot of both Numbers icons on my Dock.
Numbers 2.3 (Numbers '09) on the left with a three column graph.
Numbers 3.2 on the right with a four column graph.
https://discussions.apple.com/servlet/JiveServlet/downloadImage/2-26157062-44123 5/119-70/ScreenShot2014-06-18at7.26.53+pm.png
Both versions will run happily together. Just be sure which version is opening your document.
Instead of double clicking the document, run whichever version of Numbers/Pages/Keynote suits and use File > Open.
Regards,
Ian.
This solved my question  This helped me
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