Yes, you can upgrade to Live Assist at any time. See this TurboTax support FAQ - https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-product-orders/get-turbotax-live/...
See this TurboTax support FAQ for how to remove Live Assist - https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-subscriptions/remove-turbotax-liv...
