Como puedo cambiar de la version que tengo instalada (2.6.1) a otra version (2.8)?

como puedo cambiar de la version que tengo instalada (2.6.1) a otra version (2.8)?

Hello. 2.6.1 is an older version of D5. 2.8 is the latest version at the moment. 2.8 has been greatly optimised in terms of GI compared to 2.6.1 and many new features have been added. For details, you can refer to these posts:
What’s new in D5 Render 2.6 - News - D5 RENDER FORUM
What’s new in D5 Render 2.7 - News - D5 RENDER FORUM
What’s new in D5 Render 2.8 - News - D5 RENDER FORUM