Toolbox tries to modify Visio Installation

A hello to the forum community and enthusiasts of Daniel’s XL Toolbox. I am using the plugin for an excel intensive project… all of a sudden, it stopped working, i.e. upon click on Chart Design, an installer opens but cannot complete: image
I can not remember what changes on my machine could have caused the problem…
Is someone experiencing similar problems? I would be grateful for a hint on how to solve the issue.

Honestly, I have no clue what’s going on there and how on earth the XL Toolbox add-in could possibly trigger the Visio installer. There’s a small chance that the log file might contain some useful information.