Update README.md

Author: JulianThijssen

README.md

@@ -19,14 +19,14 @@ Additionally, a complementary public library is generated which provides:
 
 ## Requirements
 
-* Qt 6.2+ (https://www.qt.io/download)
+* Qt 5.15 (https://www.qt.io/download)
 
 ## Documentation
 Documentation of the system is automatically generated by [Doxygen](http://www.doxygen.nl/) and available [here](hdps.github.io/documentation).
 
 ## Developer Usage
 
-1. Make sure Qt 6.2 or greater is installed on your system and is added to your Path environment variable.
+1. Make sure Qt 5.15 or greater is installed on your system and is added to your Path environment variable.
 2. Retrieve the latest HDPS executable from [here](https://github.com/hdps/PublicWiki/releases/tag/v0.0.3)
 3. Download the .zip file and extract it on your computer
 4. Add a user environment variable called `HDPS_INSTALL_DIR` that points to the `HDPS` folder.