As the title suggests ive have tried numerous things to try and receive the update but still not able to. i revived a genuine key off of my friend to activate my copy of windows, but am not sure where it was from although it is still genuine.

Microfost states that it is no update able from the store if:

You might be running an edition of Windows 8 that doesnít support the free update from the Store
Some editions of Windows 8 donít support the free update to Windows 8.1. These include:

Windows 8 Enterprise

Editions of Windows 8 Pro that are installed by enterprises using KMS activation

Editions of Windows 8 that are installed using an MSDN ISO, and activated using multiple activation keys

If youíre running one of these editions, you can't install the free update to Windows 8.1 or Windows RT 8.1 from the Store.

If you installed Windows 8 using an MSDN ISO, you might be able to install Windows 8.1 using a similar ISO from MSDN.

though im not sure if my copy relates to any of these issues.

Any support will be really appreciated and i hope this can relate to other users, who need if fixed also.

Thanks Martyn