u3d 安装 license 证书问题

安装时候遇到

there was a problem validating the license because the Operating System identification seems to have changed

需要把旧的删除

C:ProgramDataUnity 

下面的ulf 删除  重启unity

点击Re-activate按钮

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原文地址：https://www.cnblogs.com/liujiang04/p/7355481.html