Hi Beth,
Let me see if we can help here.
Are you trying to install this from your Plugin area of your dashboard here?

If you are and it isn’t working please make sure to check that everything on your site is updated and that you have no 3rd party theme/plugins active.
This should enable you to install the plugin
Once you have it installed….I would then start with the WooCommerce 101 awesome video series as this will be the best way to see how to set up your site and this can be found here : http://docs.woothemes.com/document/woocommerce-101-video-series/
Hope that helps.
Plugin Support
Hannah S.L.
(@fernashes)
Automattic Happiness Engineer
We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.
Hey Guys, Im trying to use the plugin, but as soon as click on activate, the site crash with the following message : Error 503. Service Unavailable The server is temporarily unavailable. Please check back shortly. If this problem persists, please contact our Technical Support department.
I am using WordPress 4.9.5 and woocommerce 3.3.5
I have a tried with a new installation of wordpress with the same message. Also I have tried to upload manually via ftp, but nothing change.
Any advice ???
Cheers
Moderator
Jan Dembowski
(@jdembowski)
Forum Moderator and Brute Squad