Chrome is flagging our ics downloads as dangerous. How do we stop getting flagged?
We've noticed in the last couple of days that Chrome is flagging our ics file downloads as insecure:

We're getting this information form the Chrome help center:https://support.google.com/chrome/answer/6261569?p=mixed_content_downloads&visit_id=637414831076777406-3841747890&rd=1
These files are linked from our event confirmation emails and utilize the calendar file tokens within the event programs.
It's my understanding that Chrome are releasing updates to flag certain file types.
Is anyone else seeing this issue with their calendar files and know of a way around it or a way to resolve? The file is still functional if you select 'keep' but it doesn't look very professional to have your files flagged as a potential virus!
Thanks in advance for any advice.