- updated README: support

README.md

@@ -6,11 +6,16 @@ A CLI tool to create valid [BagIt](https://tools.ietf.org/html/rfc8493) based su
 As a user, you have one of three options to create your SIP: `copy`, `move` or `replace`.  
 NOTE: The use of option `copy` is strongly recommended. The remaining options modify your source directory. Please use these with caution!
 
-## Supported Operating Systems
+## Support
+### Supported Operating Systems
 * Debian 10
 * Windows 10
 
-## Installation (Debian 10)
+### Supported Versions
+* official [release builds](https://git.slub-dresden.de/digital-preservation/SLUB_SIP_Builder/-/releases) only   
+
+## Installation (Releases)
+
 1. Update system packages (optional but recommended):  
    `sudo apt update && sudo apt upgrade -y`
 2. Install required tools and libraries: