@dvo recommended to install 3.3.5beta of the Touch Display plugin. 3.3.5beta indeed has some advantages over 3.3.1stable:
Version 3.3.1 of the Touch Display plugin has a problem applying touch rotation settings which 3.3.5beta solves.
Unlike 3.3.1 the beta version also detects download errors and cancels the installation of the plugin if such an error occurs. In this case, the plugin would not appear in the list of installed plugins, giving the impression that the installation was successful.
In order to be able to install beta versions of plugins at first you need to enable “Plugins Test Mode” on
http://volumio.local/dev; maybe you have to use the IP address of your Volumio system instead of “volumio.local”.
After that in the plugin store click on the “Details” button for the Touch Display plugin and choose “Install v3.3.5(beta)” as @dvo already described.
Be aware that updating the plugin from a beta version to a newer beta version of the same plugin is not possible in the proper sense, but requires to uninstall the older version and install the newer one. Uninstalling a plugin erases the settings you may have made on the plugin’s config page.
I did not have the chance to check if it is possible to update from the beta version of a plugin to a newer stable version, but I would not expect that it works. So if you want to change to the stable branch of a plugin you would probably have to uninstall the beta version first.
IMHO this is not a deal breaker for installing a beta version, but I thought you should know that beforehand.