HikaShop Business - You reached the maximum number

Hi there

When opening the "Extension Manager: Update" the following message was included into the Hikashop Update package:
HikaShop Business - You reached the maximum number of downloads for this version

When trying to upload this update (2.3.1) the following sentence appeared:
"Invalid extension update"

I saw this update the first time today and did not upload it once! How can this be that I reached the maximum downloads for this version?

Can you help me to solve this mystery

Thanks
Raphael