Download fails and must be confirmed to be completed

[EcoMera]

Hello everyone,
maybe someone can help me. We have an MX100 with Advanced Security and version 16.16 at each of our locations. Today a problem arose that during a normal software download the download stops shortly before the end and then either cancel or continue has to be clicked.
If I click cancel, the file is unusable.
If I click continue, the file is ok.

I guess the MX100 is blocking something as the file is downloadable fine on a non MX internet connection with same Laptop.

I tried to enter the URL under Threat protection in the AMP area. That didn't help.
Maybe someone has a tip.
Thanks very much.

[PhilipDAth]

Check MX100 security event centre.

Try turning the IPS off and test it again.