You can not launch an executable from the Download folder without macOS opening it in a hidden (re-homed) sandbox someplace in tmp that breaks many apps that look for parts relative to it.
This has been true for quite a while on macOS and was done on purpose to help improve security.
Manually moving that file to your Desktop (or anyplace outside of Downloads) removes the extra metadata flags that determines if and when macOS will do that.
That is why that step is there. Some people try to run apps, executables and even third party unpackers in Downloads and that causes problems.
You accomplish the same thing when you manually move Sigil.app outside of Downloads just on the unpacked file.
Sigil is fully relocatable and will run from any location on macOS (not only Applications) so some people just left it in Downloads which caused lotsof issues as they did not know about this GateKeeper related security mechanism.
Last edited by KevinH; 12-07-2020 at 08:01 AM.
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