If you try downloading Series 101 and Series 102 in the CATALOGUES Section on this page: http://retexuk.com/download you will see that they both download with the same filename, which is wrong.
In the package manager, they have different filenames.
Thanks for your help
Unfortunately not, some of the downloads have the same filename, although in the admin side, they are different.
Please try looking a little closer as this is quite urgent that it is fixed.