- Show warning if items cannot be saved to current library, and default to my library

- Disable PDF saving with message if PDF tools are not installed

chrome/content/zotero/downloadOverlay.js

@@ -61,8 +61,13 @@ var Zotero_DownloadOverlay = new function() {
 		var win = Components.classes["@mozilla.org/appshell/window-mediator;1"]
 						.getService(Components.interfaces.nsIWindowMediator)
 						.getMostRecentWindow("navigator:browser");
-		var libraryID = (win ? win.ZoteroPane.getSelectedLibraryID() : false);
+		var libraryID, collection;
-		var collection = (win ? win.ZoteroPane.getSelectedCollection() : false);
+		try {
+			if(win.ZoteroPane.getItemGroup().filesEditable) {
+				libraryID = win.ZoteroPane.getSelectedLibraryID();
+				collection = win.ZoteroPane.getSelectedCollection();
+			}
+		} catch(e) {};
 		
 		var recognizePDF = document.getElementById('zotero-recognizePDF').checked
 				&& !document.getElementById('zotero-recognizePDF').hidden;
@@ -123,9 +128,32 @@ var Zotero_DownloadOverlay = new function() {
 		document.getElementById('rememberChoice').disabled = zoteroSelected;
 		
 		// disable recognizePDF checkbox as necessary
+		if(!Zotero.Fulltext.pdfConverterIsRegistered()) {
+			document.getElementById('zotero-noPDFTools-description').hidden = !zoteroSelected;
+			document.getElementById('zotero-recognizePDF').disabled = true;
+			window.sizeToContent();
+		} else {
 			document.getElementById('zotero-recognizePDF').disabled = !zoteroSelected;
+		}
+		
+		Zotero_DownloadOverlay.updateLibraryNote();
 	};
 	
+	/**
+	 * Determines whether the note stating that the item will be saved to "My Library" is shown
+	 */
+	this.updateLibraryNote = function() {
+		var zoteroSelected = document.getElementById('zotero-radio').selected;
+		var zp = Zotero.getActiveZoteroPane(), canSave = true;
+		try {
+			canSave = zp.getItemGroup().filesEditable;
+		} catch(e) {
+			Zotero.logError(e);
+		};
+		document.getElementById('zotero-saveToLibrary-description').hidden = !zoteroSelected || canSave;
+		window.sizeToContent();
+	}
+	
 	/**
 	 * Called when the save dialog is opened
 	 */
@@ -170,3 +198,4 @@ var Zotero_DownloadOverlay = new function() {
 }
 
 window.addEventListener("load", Zotero_DownloadOverlay.init, false);
+window.addEventListener("activate", Zotero_DownloadOverlay.updateLibraryNote, false);

chrome/content/zotero/downloadOverlay.xul

@@ -41,7 +41,9 @@
 		<vbox insertbefore="save" id="zotero-container" flex="1" hidden="true">
 			<radio id="zotero-radio" label="&zotero.downloadManager.label;" disabled="true"/>
 			<vbox style="margin-left: 10px">
+				<description id="zotero-saveToLibrary-description" style="font: -moz-info" hidden="true">&zotero.downloadManager.saveToLibrary.description;</description>
 				<checkbox id="zotero-recognizePDF" hidden="true" persist="checked" disabled="true"/>
+				<description style="margin-left: 20px; font: -moz-info" id="zotero-noPDFTools-description" hidden="true">&zotero.downloadManager.noPDFTools.description;</description>
 			</vbox>
 		</vbox>
 	</radiogroup>