After own download, I cannot open the new app

My problem is:


1) I download a zip file (new program version) from my app. The zip file arrives, can be unpacked, but I try to open the new app I get a message from macOS: „The application cannot be open“


The file has the same size as the original, a checksum (512) is identical and a byte by byte match of files are equal


2) I can unzip the original and start without any problems.


3 )When I download the zip file via Safari I can unzip and start it.


4) Under a VM with Parallels: If I use the share folder, copy the zip file to the desktop (the lock option is loosing after copy of the file(!!!!), I can extract and start the unzip app.


If I mount normally under VM , I get the same problem. (locked is on, after copy)


What do I have to do to ensure that my unpacked program is started normally?


The size of the unpacked program is the same as the original.