Purchased logic pro x missing in App Store after OS update to Yosemite

I'm currently using a MacBook Pro 13" (mid-2011) running on OSX Mountain Lion. I've also acquired an iMac (mid-2011) recently but chose to update the OS to OSX Yosemite on the iMac to try out the new OS.

On the Macbook:

Logic Pro X purchased. App store doesn't show it under purchased category (and i've tried troubleshooting the hidden options) ; but at least when i search for the Logic Pro X app, it gives the option of [Install] rather than [Buy]

On the iMac:

Not shown in purchased category ; and when i searched for it , it gives the option of [Buy] only.

Can anyone help me please!!!!!!!