Currently have v. 18.104.22.16832; using Mozilla Firefox 18.0 on Windows 7 Home Premium. In trying to uninstall, I receive a Windows Installer message "The feature you are trying to use is on a network resource that is unavailable. Click OK to try again or enter an alternate path to a folder containing the installation package 'Evernote.msi' in the box below." The Use source box is searching for "c:\Users\Burke\AppData\Local\Temp\" In browsing/searching for the Evernote.msi folder, the only location that this file appears in is "Computer/Program Files (x86)/Evernote/Evernote". I can't get past this point either trying to uninstall 4.5.1 through Control Panel or trying to install 4.6.1 through either the pop-up reminder or the link on evernote.com. As I close out of the installer, I get an ultimate message from Windows Installer: "The installation source for this product is not available. Verify that the source exists and that you can access it." I am synced and can access my notes via both tablet and smartphone as well as the web version. I can also still use 4.5.1 on the desktop, so the installation does not seem to have been corrupted from my attempts to uninstall. Can you offer a suggestion as to how to continue with this upgrade? Thanks in advance.