Reinstall of previous purchased packages

Hello,

After my HDD failure last week, I had to reinstall Ubuntu Gnome 13.10 this last weekend!

Now I try to reinstall 3 'purchased' (free) software packages.

When I click the option 'Reinstall previous purchased packages' it asks for my Ubuntu One login.
Login succeeds.
Then it gives my 3 software packages in a list; I click the first one to reinstall and get the constant reappearing message:

" This requiers installing packages from unauthenticaed sources'.
Details: 'create-launcher'

With 'Ok' and 'Repair'

Whatever I do; the error message keeps on appearing blocking further use of my Ubuntu Software Center.
The only thing left is killing the process 'ubuntu-software' in the 'System Monitor', 'Processes'.

is there an option to be (un)ticked anywhere about being able to (re)install this 'software from unauthenticated sources'?

I DID copy the 3 'main' and 'src' lines and added those to my repositories, without adding the keys....
Might that be the culprit?

I'll try removing those 3 (x2) entries (src & main) and will try again to reinstall my previous (free) purchased software in the meantime!

Thank you.

Kind regards,

Ed