"download" a file after clicked the logout button.

Good day Carson

Please return to your design under button even rules , trace your steps from there and reconfigure your rules again. check out this link perform such well (https://help.k2.com/onlinehelp/k2five/userguide/5.1/default.htm#Create/K2Designer/Controls/Controls.htm)

Note: this might not be exact answer but if it leads you to the answer mark it as "kudo, accepted soution"

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Good day Carson

Please follow this link: https://help.k2.com/support-services/kbt154698 to achieve what you want to do. 

Thank you

Kind regards

Thabang

Hi there,

The file that is being downloaded is presented to the site when signing out of the STS as part of the standard WS-Federation signout action. More information about it can be found here under 'Signing Out from Multiple RPs':

"Every successful cleanup sends back the image of the green check box, which the STS page can use for confirming that the sign-out actually took place for a given RP. Failure to render the image might be an indication that something went wrong with the cleanup operations."

This image is generated by the Windows Identity or .net Framework and is not a part of K2.

A possible workaround would be to remove the X-Content-Type-Options header when the request contains the wa=wsignoutcleanup1.0 parameter via a rewrite rule in IIS.