Installation Error: There seems to be a problem with the downloaded file(s)

I was able to find a few posts referencing this, and the solution seems to be the same.  Unfortunately the solution seems a little extreme.  I would try to just re-install the CC desktop app and the particular app you are having issues with before trying to uninstall everything as suggested.

Error P205 Photoshop

Install error P205

uninstall everything cc including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html

then uninstall the cc desktop app, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html

clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html

restart your computer (don't skip this)

reinstall the cc desktop app, https://creative.adobe.com/products/creative-cloud.

if you're unable to install the cc desktop app at this stage, use an administrator account (solution 3 here, https://helpx.adobe.com/creative-cloud/kb/creative-cloud-missing-damaged.html)

use the desktop app to install your cc programs/trials