I can not Install AnkhSVN -Subversion Support for Visual Studio 2019,
I have tried to Install It, It says Version is Invalid for VS2019
I use VS2019 Professional
I've just installed AnkhSVN 2.8.12824 via "Manage Extensions". It seems to work, though Visual Studio 2019 complains that it might not be compatible with a future Visual Studio update (Deprecated APIs).
See also https://ankhsvn.open.collab.net/ds/viewMessage.do?dsForumId=582&dsMessageId=647485
Possibly also https://docs.microsoft.com/en-us/visualstudio/extensibility/synchronously-autoloaded-extensions?view=vs-2019