How can I downgrade apps from the Cydia Store? Is it possible to downgrade apps you have upgraded in the Cydia Store? (Jailbroken) If so how would you do it?
The only way (as far as I know having experience with Cydia repos) is to find a respiratory with the older version as when you push an update to Cydia you take out the original.

I'm sure if you run a quick google search for the version of whichever Cydia app (.deb) you are looking for you'll be able to find it.