I am using Portable Thunderbird on a Win XP SP3 platform for some time. Recently I tried to update it to the latest version by clicking on the update link in the help menu. Although it downloaded the full software without a problem, it is not able to update the software. Everytime I start Thunderbird, it tried to install the downloaded version but fails saying
"One or more files could not be updated. Please make sure that all applications are closed and that you have permissions to modify files and then restart Thunderbird to try again"
Is this because I am using a portable version. If it is, is there any process to update it directly or do I have to download a fresh version of Portable Thunderbird and do all my settings again.