I created a shim for SP2010 that will cause all Infopath forms in a sharepoint 2010 site to download, as long as the link to the form is in Sharepoint 2010. You will need jquery 1.12 for this to run.
$(function() {
if (document.getElementsByTagName('BODY')[0].innerHTML.indexOf('.xsn') != -1) {
$('a[href$=".xsn"]').each(function(index) {
var self = $(this);
var fileLocation = '';
var spDownloadsUrl = '/_layouts/download.aspx?SourceUrl=';
//GRAB LINK'S HREF LINK PATH AND URI ENCODE IT
var currentUrl = encodeURI(self.attr('href'));
//IF THE HREF IS TO A NETWORK FILE LOCATION EXIT THE PROCESS AND LEAVE IT ALONE
if (currentUrl.indexOf('file:') != -1) {
return;
}
//SHAREPOINT 2010 DOC LIST ELEMENTS HAVE INLINE JS ALTERING THE LINK BEHAVIOR, SO THEY NEED TO BE REMOVED
self.removeAttr('onclick');
self.removeAttr('onmousedown');
self.removeAttr('onfocus');
//IF THE LINK'S URL IS ABSOLUTE PATH, BUILD IT AS RELATIVE
if (currentUrl.indexOf('.com') != -1) {
var urlSplitOnDotCom = currentUrl.split('.com');
var urlAfterDotCom = urlSplitOnDotCom[1];
var urlPartsArr = urlAfterDotCom.split('/');
//REBUILD URL FROM ARRAY
var newPathname = "";
for (i = 1; i < urlPartsArr.length; i++) {
newPathname += "/";
newPathname += urlPartsArr[i];
}
fileLocation = newPathname;
} else {
fileLocation = currentUrl;
}
//ADD NEW URL TO INFOPATH FILE'S HREF ATTRIBUTE
self.attr('href', spDownloadsUrl + fileLocation);
});
}
});