Update HOWTO.md

HOWTO.md

@@ -2,7 +2,7 @@
 
 ## 1. Requirements 
 
-You need at least CMK 2.2.0 or CMK 2.3.0 to use the Network visualization
+You need at least CMK 2.3.0 to use the Network Visualization Data Creation Tool.
 
 ## 2. Installed packages
 
@@ -21,9 +21,6 @@ For the name to service matching (optional, but recommended)
 For the topology data creation
 - [NVDCT (NetworkVisualizationDataCreationTool) plugin](https://thl-cmk.hopto.org/gitlab/checkmk/vendor-independent/nvdct)
 
-For topology visualization (**only CMK 2.2.0x**, CMK 2.3.0 has this built-in)
-- [Network visualization plugin](https://exchange.checkmk.com/p/network-visualization)
-
 **Note**: [Here](https://thl-cmk.hopto.org/gitlab/explore/projects/topics/Network%20Visualization) you can find all plugins from this page at one place.
 
 If you are done with the package installation your package repository should look like this
@@ -101,7 +98,6 @@ total 20
 0 lrwxrwxrwx 1 build build   57 Apr 30 14:25 default -> /omd/sites/build/var/check_mk/topology/data/2024-04-30T14:25:17.04/
 
 ```
-For CMK 2.2.0 you will find those files under `~/var/topology_data/`
 
 ## 8. Go to CMK and show the network topology