The Sword Art Online Progressive movies can be watched in theaters where they are being screened. Additionally, they may also be available for streaming on various online platforms or for purchase on DVD or Blu-ray. It's best to check with your local theaters or streaming services for availability. **

Yes, you can watch Sword Art Online Progressive independently of Sword Art Online. Sword Art Online Progressive is a retelling of the original Sword Art Online story, focusing more on the Aincrad arc and providing additional details and character development. While having knowledge of the original Sword Art Online series may enhance your understanding of certain references and characters, it is not necessary to enjoy Sword Art Online Progressive as a standalone series. **

Yes, one can watch Sword Art Online Progressive independently of Sword Art Online. Sword Art Online Progressive is a retelling of the original Sword Art Online story from the perspective of Asuna, focusing on the early floors of Aincrad. While it is set in the same world and timeline as Sword Art Online, Progressive can be enjoyed as a standalone series without needing to have watched the original Sword Art Online. **

To attach the Billy bookcase extension to the Billy bookcase from Ikea, you will need to first assemble the extension according to the provided instructions. Once the extension is assembled, you can simply place it on top of the existing Billy bookcase and secure it in place using the provided hardware, typically screws or brackets. Make sure to follow the specific instructions provided with the extension to ensure a secure and stable attachment to the bookcase. **

Art design focuses on creating visually appealing and expressive works of art that evoke emotions and convey messages. It is often more subjective and open to interpretation. On the other hand, industrial design is more functional and practical, focusing on creating products that are user-friendly, efficient, and aesthetically pleasing. Industrial design also considers factors such as production processes, materials, and market demands. Overall, while art design is more about creativity and self-expression, industrial design is more about problem-solving and meeting specific user needs. **

To attach the Billy bookcase extension unit to the Billy bookcase from Ikea, you will need to align the pre-drilled holes on the side of the extension unit with the corresponding holes on the side of the bookcase. Then, use the provided screws to secure the extension unit to the bookcase by inserting them through the holes and tightening them with a screwdriver. Make sure to follow the assembly instructions provided by Ikea for a secure attachment. **

One can watch Sword Art Online on various streaming platforms such as Netflix, Hulu, Crunchyroll, and Funimation. Additionally, the anime series may also be available for purchase or rental on platforms like Amazon Prime Video, Google Play Movies & TV, and iTunes. Sword Art Online may also be available on certain cable or satellite TV channels that specialize in airing anime content. **

You can watch Sword Art Online: Alicization without having seen the previous seasons by reading a summary of the previous storylines or watching a recap video. This will give you a basic understanding of the characters and the world of Sword Art Online. Additionally, you can start watching Alicization and gradually pick up on the backstory and character relationships as the story progresses. The show also provides some context and explanations for new viewers to understand the plot. **