whenever i try downloading unity it reaches 100% then says it cant be installed then closes i have this problem for 3 months now and i cant fix it its not a space problem.so if someone can help
Try installing the editor directly from the download archive.
After it is installed you can then add it to the Hub, instead of installing it through the Hub. Installing the editor directly will likely result in a more useful error message if/when it fails than the install in the background method the Hub uses.