Upgrade to Turbo Tax Online Self Employed

My computer no longer meets system requirements for Mac for turbotax deluxe download so I thought about upgrading to turbotax mac online self employed.  Right now I have the download version for turbo tax deluxe which I have the dmg file but have not installed it yet on a computer.  I have a small part time business as well as dividend, interest income, schedule k, foreign tax credit, schedule e, royalties etc.  My return has a lot of entries from several brokerage houses.  How do I upgrade to turbo tax online self employed?  Does the turbo tax online self employed use the interview process?   I am used to using the forms method but my old mac no longer supports the software.  I am still decided whether or not to spring for a new computer.  Thanks for any advice,

Richard P. Gunion