Mac newbie installation issues

Hello, I am a Windows user and rarely touch a Mac althouogh I do have one running Sequoia.

I get terrible spam on my Windows computer and not been able to find a good spam filter for iMap I came across this so thought that if I filter my emails in the Mac with SS then that would clean up the Windows one.

Trouble is I cannot install it

I downloaded it, and run it. It puts an icon on my desktop which as per instructions I move to my applications folder where it appears as a download again. Running it produces the box telling me to move it into my applications folder. Just going around in circles so clearly doing something wrong. I tried the download fixer in case but after downloading it Apple tells me it is corrupt and not fixable so that is weird

Any points would be appreciated

It would help me understand what’s going on if you could post some screenshots showing what you did and what errors were reported.