App-Store Upgrade Fail

Hi, I have installed PayPlans from an old version, went through the progressive steps and everything has updated OK. When I go to the App Store it suggests that I update with the following popup notification...

"A new version of RB-Installer (App Store) is available. Please click on below Upgrade buton to install it. It is recommended to always use latest version of RB-Installer."

When I click the upgrade buttons it gives the following error... (image attached)
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