1.21.1 not updating to 7.51.1

1.21.1: Image description

1.21.10:

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SOLVED!!!! by go into this link https://www.wurstclient.net/updates/wurst-7-51-1/, scroll down and find 1.21.1 version:

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brightforever Or, you know, just press F5 on the 1.21.1 list page. Your browser was caching an old version of it.