If it keeps updating and you don't want to disable the repo or updates do the following.
1. Close Kodi
2. Download the official plugin.
3. Unzip the the main contents of the downloaded file to the kodi\addons\plugin.video.stalker folder and overwrite everything.
4. go to the kodi\addons\plugin.video.stalker folder and open addon.xml with a text editor.
5 Change this line from <addon id="plugin.video.stalker" name="IPTV Stalker" version="1.0.18" provider-name="esxbr"> to <addon id="plugin.video.stalker" name="IPTV Stalker" version="1.2.0" provider-name="esxbr">
6. Save.
Now when you open kodi it will not update as it already thinks it is up to date. At least until a new version is released.