I understand you are having some difficulty with the WP eStore plugin but just telling me that “I find the thing simply does not work” doesn’t really help.
If you explain what the issue is (which part isn’t working) then I will be able to assist you in resolving it.
Also, please read this post if you get time so you understand how to get help:
https://support.tipsandtricks-hq.com/forums/topic/how-to-get-help-please-read