Until October 24, 2024, you can get the Synty Construction – Low Polygon Pack asset set for free from the Unity Asset Store, a service used by Unity-powered project development. To do this, simply use the code SYNTY2024 at checkout to reduce the price to zero.
This can be done https://assetstore.unity.com/packages/3d/environments/industrial/polygon-construction-low-poly-3d-art-by-synty-168036.