login button

I have got two problems. I'm using the theme forest. 1/ I can't update the latest version of WPLMS. This is the first time I've tried to update it. I've tried with the update button but the theme does not appear. I've tried with an API key, but this is the same.The theme still does not appear in the updates. Finally I've downloaded the zip from envato and install it manually but after 15 mn, nothing appears, changes .... and eventually the conection is lost. 2/ unfortunately, I've updated all the other plugins (vibe....) and now the button connect is not working anymore! If you click on it, the login pop up does not appear. I'm lost!!! What can I do?