现在用的14267想升级预览版14291，可是系统一直无法检测到更新，心想下个镜像自己安装，微软却跟我要产品密钥没法升级，求大神该咋办？

不应该啊。。之前不是Pro版?
PRODUCTION KEYS for Client buildsFor partners who do not have access to production keys (via MSDN, MOO or KMS), if you are performing boot from media clean installs of Windows 10, you can skip entering the product key in setup. Windows will not activate, but it should not impact functionality for your testing purposes. If you run Windows 10 setup for an activated downlevel OS, so long as the edition of the downlevel OS matches the windows 10 edition you are upgrading to, you will not be prompted for a key. If you try cross edition upgrade of Windows 10 (e.g. from an activated Windows 10 Home edition on build 10240 to 14291 Windows 10 Pro), then you will be prompted for a product key.
---贴吧极速版 For UWP

系统显示是家庭版windows10 home insider preview china

我也是14267检测不到14291

前两天晚上忽然自动下载更新了，已升级

我有13的幻影太刀，给哪个好，剑魂，黑暗无视，剑皇，鬼泣，狂战