App Store purchases are safe and simple, so you can start playing, gaming, reading — or just doing — right away. Create a secure account with your preferred payment method on file and it’s easily accessible across your devices and the web.

Mac App Store is the simplest way to find and download apps for your Mac. To download apps from the Mac App Store, you need a Mac with OS X 10.6.6 or later. The reason why app prompt the old user account is because the app was installed by the old user, and the purchase/install history (App Store called it purchase even the app is free) was made by the old user. To solve this, you need to delete the app first (move to bin) than reinstall it again. Reinstall the app will update the app as well.

Welcome to the Apple Support Communities!
I understand you are having trouble updating apps on the Mac App Store. Is the issue only with these four updates? Are you able to download a free app from the Mac App Store?
The first thing I would suggest is to sign out of the Mac App Store, and restart your computer. This will establish a new connection to the internet.
Before clicking on the Mac App Store, visit the Apple ID page below and confirm that you are able to sign in with your Apple ID and password. While you are in your Apple ID account, check the billing section to make sure everything is up to date and there are no blank fields.
Change or remove your Apple ID payment information

If you want to check your payment information: Transfer photos from iphone to mac photos app.

How to make a Stickies note float on top of all windowsIf you want your note to follow you wherever you go on your Mac, you can make it float on top of every Window, so that even when you change apps, you'll see your Stickie. Click New Note. Click File in the menu bar on the top left of your screen. Using stickies app on mac collaborating iwth ipad. Alternatively, you can press Command-N on your keyboard.Type your note.Source: iMoreThat's it; you've made a Stickie!

1. Sign in to your Apple ID account page.
2. In the Payment & Shipping section, click Edit Payment Information.
3. Change your payment information.
4. Click Save.

Now, open the Mac App Store and sign in with the same Apple ID and password you used earlier.
Click on the Purchases tab. Try updating only one application at a time.
If the issue persists you can delete the app from the Applications folder in Finder and redownload it.
Redownload music, movies, TV shows, apps, and books from the iTunes Store, iBooks Store, and App Store
Take care.

App Store Log In

Aug 14, 2017 6:57 PM

Apple Id Account Page App

1. Preview, buy, or rent movies in up to 1080p HD on iTunes. Browse more than 65,000 comedies, romances, classics, indies, and thrillers and your downloads will be instantly accessible.
2. So, just enter the verification code that Apple sent to that trusted device after your password and you will be able to access the Mac App Store. How do I turn off two-step verification? Sign in to your Apple ID account page. In the Security section, Click Edit. Click Turn Off Two-Step Verification.
3. To create this tutorial, I created a completely new App Store account and submitted a new app to the App Store, keeping careful note of each step along the way. This tutorial will walk through the process to submit an app called Drop Charge, which comes from 2D iOS & tvOS Games by Tutorials.