I have just started having problems with Foxit when i tried to print.
I found PDF-XChange Viewer that seems to be working and seems to be portable, at least i didn't have to install it.
I'm wondering why you chose to offer Foxit Reader and Sumatra PDF Viewer.
Especialy with the comments on this page.
http://www.techsupportalert.com/best-free-non-adobe-pdf-reader.htm
BTW they recommend Portableapps and PDF-XChange
http://www.techsupportalert.com/best-free-portable-programs.htm#bfp-suit...
did you try the PDF-XChange Viewer Portable that is in the Beta Testing forum?
https://portableapps.com/node/21646
ps: found that link very quickly with the search box [top right of Portable Apps pages]
No, i just used the portable version from the original site.
I hope it gets out of beta and becomes the standard pdf viewer for portableapps.