套件安裝失敗可能權限或網路問題可以確認一下,如果沒有安裝到這類文件套件一般都是為了查找便利性,對於功能參照或引用個人覺得這應該影響不大
If you are trying to install a new package from the registry and it is not working, it might be due to permission problems.
You must have full permissions on the cache folder:
Windows: C:\Users\yourname\AppData\Local\Unity\cache
MacOS: ~/Users/Library/Unity/cache
It might be a problem with the network. Check your firewall and proxy settings.
Sometimes institutional environments, such as schools, government offices, or network-protected workplaces set up proxy servers to control traffic between the network and the Internet, and use their own server certificates which are not recognized by Unity or the Package Manager. Talk to your network administrator.
Offline documentation Download
https://docs.unity3d.com/Manual/OfflineDocumentation.html