You do not need to uninstall the old version of the plugin and it is not recommended.
No need to upload a zip file, just follow the procedure below:
STEP 1: Update your plugin version
- Go to the Configuration > Plugin manager > Installed page
- Spot the Lengow plugin
- Click on the install update icon
STEP 2: Check the plugin version
Check the version of Lengow plugin has correctly changed by going to any page and looking at the footer.
