Now it's working perfectly.
About the question regards the password I mentioned before, do you have any idea? Because in the worst case if i ever forget my password and before that I also deactivated all the important comand then as a result I can't use this plugin manager anymore. It would be really a pity! (I hope nobody would be in this situation )
As a suggestion, if you have time, can you implement (although I don't know if it's a difficult thing or not) the function/comand copy/paste to transfer the line from one file to another as suggested by Halvhjearne? Maybe we will never use it but it will make this plugin manager more complete.
And one last thing..... I can't wait to see the final version of this plugin manager