I just tried to (auto) upgrade the Affiliates plugin

Hi,

I just tried to (auto) upgrade the Affiliates plugin from 3.1.5. to 3.1.5.1 and I get the following error message:

PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

Could you please tell me what I have to do in this case ?

Thanks