Found it.
The first one on the Google Search was an installer which put the DLL's on C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI
Where Can I get Microsoft.SharePoint.Client.dll

In order to write a C# program to work with SharePoint, the Code needs to include a namespace from SharePoint. The problem is that for some companies, SharePoint is on a cloud and it is not easy for a developer to access Microsoft.SharePoint.Client.dll because it might not exist on the local machine. So, is Microsoft.SharePoint.Client.dll available somewhere for downloading?
3 answers
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William Thompson 120 Reputation points
2024-01-24T20:22:15.17+00:00 -
RaytheonXie_MSFT 40,006 Reputation points Microsoft External Staff
2024-01-25T01:37:52.62+00:00 Hi @William Thompson,
I'm glad to hear you solve the problem ,if you have any issue about SharePoint, you are welcome to raise a ticket in this forum.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others." and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[Where Can I get Microsoft.SharePoint.Client.dll]
Issue Symptom:
SharePoint is on a cloud and it is not easy for a developer to access Microsoft.SharePoint.Client.dll
Solution:
Find the installer in google and install the dll in path C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI
---You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks for your understanding!
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杨建宇 86 Reputation points MVP
2024-02-11T03:35:29.9833333+00:00 if you want to develop a tool with Microsoft.SharePoint.Client.dll, suggest that you can setup a sharepoint on promise evniroment and vs studio. then you can develop your project in it. if you only copy the dll to your local, you can't debug the program. so it's difficult to develop and make sure the program can work normally. C:\Program Files\Common Files\microsoft shared\Web Server Extensions*version number*\ISAPI version version number 2007 13 2010 14 2013 15 2016 and 2019 16