Download https://download.imagemagick.org/ImageMagick/download/binaries/ImageMagick-7.1.0-portable-Q16-x64.zip
Extract it to C:\Program Files\ImageMagick-7.1.0-portable-Q16-x64
Make sure the executing user of confluence can read this directory (Username is usually confluence).
You can add the executing user of confluence to the directory ACL by right-click and properties on the directory ImageMagick-7.1.0-portable-Q16-x64
Click on edit:
Image RemovedImage AddedClick on add:
Image RemovedImage AddedType the execution user of confluence and click on “Check Names”
Click on ok.
Note the path C:\Program Files\ImageMagick-7.1.0-portable-Q16-x64\convert.exe