1. Go to Codecanyon, from your profile page and you will the tab 'Download'. You can download the latest version from there.

2. Unzip the package(All files package) and you will find the file "tourmaster.zip".

3. Go to your wp dashboard > Plugins > Upload. (Please note that if you customized the plugin's code, you have to do via FTP method to replace file by file. You can see changelog for modified files)

4. Upload the plugin that you download, click to replace the old files and activate it.

5. Go to Setting > Permalink, switch permalink mode to the default one(the top one.) and then switch it back.

6. If the site doesn't work properly, clear browser's cache.