Update README.md

README.md

@@ -15,16 +15,23 @@ Supported models:
 ---
 ### Download
 
-* [inv_opengear_serial_line.mkp (latest version)](https://thl-cmk.hopto.org/gitlab/checkmk/opengear/inv_opengear_serial_line/-/raw/master/inv_opengear_serial_line.mkp "Download latest version")
+* [Download latest mkp file][PACKAGE]
+
+**Note**: before you update to a newer version, always check the [CHANGELOG](CHANGELOG). There might be incompatible changes.
 
 ---                   
 ### Installation
 
-You can install the package by uploading it to your CheckMK 
-site and as site user run `mkp add inv_opengear_serial_line.mkp` and `mkp enable inv_opengear_serial_line.mkp`.
-
-
-In the Enterprise/Free edition of CheckMK you can use the GUI to install the package (_Setup_ -> _Extension Packages_ -> _Upload package_)
+You can install the package by uploading it to your CheckMK site and as site user run 
+```
+mkp install PACKAGENAME-VERSION.mkp
+```
+or beginning with CMK2.2.x
+```
+mkp add PACKAGENAME-VERSION.mkp
+mkp enable PACKAGENAME VERSION
+```
+In the non RAW editions of CheckMK you can use the GUI to install the package (_Setup_ -> _Extension Packages_ -> _Upload package_)
 
 ---
 ### Want to contribute?
@@ -34,4 +41,4 @@ Nice ;-) Have a look at the [contribution guidelines](CONTRIBUTING.md "Contribut
 ---
 ### Sample inventory output
 
-![sample inventory output](/doc/sample.png?raw=true "sample inventory output")
+![sample inventory output](img/sample.png?raw=true "sample inventory output")