Update blocked by Windows 10

[StuartR]

Here's details on what I run into with trying to update-

Open jamkazam windows app -> starts to auto-update -> Bitdefender antivirus blocks app update -> app directs me to download directly from the jamkazam website

Download installation package from site -> windows defender warning, run anyway -> windows error message: not a valid installation package

I sent jamkazam an email to their support already and they told me- 

"We haven't had any other reports of antivirus blocking or a bad installation package. We'll take a quick look at this, but it sounds specific to something on your individual system, or we would have heard about it from others."

A few days later there was another update and no issues with the installation of that one. I just have a standard windows 10 installation, nothing special.

Installation versions in question:
JamKazam-1.0.3931 was the problem install
JamKazam-1.0.3934 had no problems

Then again today same errors and problems with version JamKazam-1.0.3950

I had the same problem. The solution was "easy":

I found out, that the file I have downloaded had a size of only 12kb This is much to smal for an updatefile.
This was, because my virus-software blocked the download. Bitdefender replaced the content of the file.

My solution was to disable the "check websites for male-ware" in Bitdefender
(do not forget to switch it on again after download / install !)

cu

I'm curious. Why did you feel the need to install a third party antivirus package in Windows? Microsoft has a perfectly good one built in and it's free.