How do I "work around" the security 'thing on windodows 10 re: downloading and running portable app and

I got the impression that I could download portable app to my stick and it would download and in stall on my stick my portable apps like openoffice, Instead I have all these .EXC files that I can not run with out getting rid of the windows security "thing : you will note I am NOT a tech.. I'm 78 and not as fast as I used to be. IF I where to use a NON windows ten computer to "install" the portable files and then transfer the 'installed" portable files to my stick would that work??

and I would need to do that with the portable app platform also?

Thank you for any help