Update README.md

Author: njqdev

README.md

@@ -22,7 +22,7 @@ If 0, only the current editor document is searched, which increases speed but ca
 
 ## Installation
 
-Get this extension from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=vscode-python-typehint).
+The extension can be installed manually with a [VSIX file]https://github.com/nj-q/vscode-python-typehint/releases/tag/v1.0.0.
 
 ## Known Issues