We have been experiencing this problem since a few days and it seems to be related to a 3rd party plug-in that we are using.
We have meanwhile investigated and resolved the issue. If you download the software again and use the latest download to install the software, you will be OK.
We appologise for the inconvenience.

EDIT: Customer has confirmed that the problem has been solved by the latest download.

Hello,
I just paid the business edition and made the download. The file received is plg_Login_One_Business_J30_2320_UNZIP_1ST.zip but I can not open it, it seem corrupted.

Please advise urgently where to get the right version!

Edit: I just tried it with another browser and received "Maximum number of downloads reached"... you kidding, right?