We definitely want to make sure that you can download apps correctly! Are you getting any error messages when trying to download them? Are they by the same developer? Have you contacted the developer? Are you trying to download from the phone directly or the Play Store on the computer?
Please keep us posted on the details of what's happening so we can get everything figured out for you!
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The Droid X has only 8GB on board storage and which version of Android software is it running?
Do you have room to download?
Will the App download and run on your version of android software?