[Windows Phone 7 Q&A, Help & Troubleshooting] mikaelel:
Install the Refresh Marketplace App to continue using Marketplace

Microsoft is continuing a series of infrastructure upgrades to improve Windows Phone Marketplace. While most Windows Phone users’ phones have automatically been switched over to the improved Windows Phone Marketplace infrastructure, in the coming weeks a small number of users will need to install a simple Refresh Marketplace App to continue using Marketplace to download and/or update Windows Phone apps.

The Refresh Marketplace App is a small app developed by Microsoft to help some Windows Phone users complete their transition to the improved Windows Phone Marketplace infrastructure. The app will make changes to the Marketplace configuration on the phone to ensure that it communicates with the updated online Marketplace infrastructure. Installation of this FREE app involves the same basic installation steps as any Windows Phone app. You can download it over a cellular data connection or Wi-Fi, and it takes only a few minutes to install and run.

If you are one of the small number of users who needs to install and run the Refresh Marketplace App to continue using Marketplace, you will receive a You must install the Refresh Marketplace App notice and will see this app as the only one featured within the Marketplace Hub on your phone. Follow the instructions below to download and install the Refresh Marketplace App:

1.

Ensure your Windows Phone is connected to a cellular data connection or Wi-Fi.

2.

Open the Marketplace Hub.

3.

Tap the Refresh Marketplace App icon or name to go to the app details page, and then tap Install to download and install the app. The Refresh Marketplace App will be installed within the Games Hub on your phone, opening the Games Hub in the process.

4.

Find and tap the Refresh Marketplace App in the Games Hub, then follow the on-screen instructions to complete reconfiguring your phone to access the updated online Marketplace infrastructure.

5.

Re-open the Marketplace Hub. You should no longer see the You must install the Refresh Marketplace App notice, and you should be able to see various featured apps and games. You can now continue to use Marketplace on your Windows Phone—enjoy! If you choose, you can uninstall the Refresh Marketplace App at this time.

Troubleshooting

If, after following the previous steps, you continue to receive the You must install the Refresh Marketplace App notice or are unable to install apps from the Marketplace Hub on your phone, do the following:

Basic

1.

Turn off your Windows Phone by holding down the power button and following the on-screen instruction to Slide down to power off.

2.

After a few seconds, push the power button to restart your phone.

3.

Ensure your Windows Phone is connected to a cellular data connection or Wi-Fi, then plug it in using the wall charger that came with your phone. Leave your phone plugged in for at least 10 minutes, then try again to access Marketplace.

4.

Re-open the Marketplace Hub. You should no longer see the You must install the Refresh Marketplace App notice, and you should be able to see various featured apps and games. You can now continue to download apps from Marketplace—enjoy!

If you continue to have problems, see the following Advanced steps.

Advanced

1.

From the Start screen on your Windows Phone, flick left to the App List. Scroll to the Games Hub and note whether the Games Hub icon says Xbox LIVE or not. If yes, continue with Step 2. If not, skip to Step 5.

2.

Tap the Xbox LIVE Games icon to open the Games Hub.

3.

Tap More , then tap Refresh. You should see Updating... on the top-left of the screen. When this goes away, continue to Step 4.

4.

Re-open the Marketplace Hub. You should no longer see the You must install the Refresh Marketplace App notice, and you should be able to see various featured apps and games. You can now continue to use Marketplace—enjoy!

If you continue to have problems, do the following:

5.

If your Games Hub icon doesn't say Xbox LIVE (or if Steps 1-4 don't restore the full Marketplace experience), plug in your Windows Phone using it's wall charger, ensure your phone is connected to a cellular data connection or Wi-Fi, and charge your phone for at least 24 hours. During this time, your phone will automatically attempt to connect to the updated online Windows Phone Marketplace infrastructure, after which you should be able to continue using Marketplace.

If after following all of the steps above you continue to have problems, contact Microsoft Support.

source: http://www.windowsphone.com/en-us/how-to/wp7/apps/download-apps-and-games-faq

see also (Spanish); here *. xap to download: http://www.elcajontecnologico.com/actualiser-marketplace-t5765.html