How to transfer from my computer downloaded iPhone apps?

I've just had to restore my phone, re-jailbreaking as i type this. I no longer have all my apps that i got from Installous. Can i just download the apps from wherever on my computer, then use a program to install them, eliminating the need for installous?

Is that possible, or am i to spend hours upon hours trying to get them all from installous?

Sorry about poor spelling and what not, trying to kill a mozzie.

Sorry,
i didnot use it before maybe you can ask for their support, right?

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