Importing from LastPass works unless something was changed on their end affecting our import tool. Importing it as a CSV independent file is not supported, the way it works is their API connects directly to our server to initiate the importing process.
Also, we are moving into the extension first model and we will be phasing out the desktop standalone application. This means that TK will open only within the supported browsers (Edge, Firefox and Chrome). Importing tool wont be supported with this new application model.