Hi Kristos,
Sorry to hear you are still having trouble.
I just double checked the links and both are still live and work fine for me.
The only thing i can think of is that your email client (outlook, gmail etc) is cutting the link in half, this happens because the links are quite long.
Copy the link from your email into your browser address bar and make sure that the end of th link ends in optimallearning.zip or creativeflow.zip if it doesnt it means the link is getting chopped and on 2 lines rather than one.
the simplest way is to paste the link into notepad or another text editor and see if the link is on 2 lines if it is make it so it isn't and re copy into your browser.
I hope that makes sense.
Grant
BTW: I am still unsure as to why you can't download these from the download center.. if you are still having issues let me know and I can look into this further.