update readme

Author: arch

contrib/Installer/README.md

@@ -5,10 +5,10 @@
 1. Download OFS from https://github.com/OpenFunscripter/OFS/releases.
 2. Install OFS if you prefer the installer version (`exe`) else extract the OFS archive.
 3. Start OFS at least one and close it again.
-4. Download the MTFG OFS Extension Installer from https://github.com/michael-mueller-git/Python-Funscript-Editor/releases
-5. Run Install
+4. Download the MTFG OFS Extension Installer from https://github.com/michael-mueller-git/Python-Funscript-Editor/releases.
+5. Execute the downloaded executable. Wait for the installation to complete.
 6. Open OFS and activate the extension.
-7. Add global key binding for the extension in OFS
+7. Add global key binding for the extension in OFS.
 
 ## Build Installer from Source