"Plug-in file does not exist" ?!?!?

We’re returning to our wordpress site after many months of neglect, only to find that wordpress no longer recognizes our jigoshop plugin. When I open the plugins page in the wordpress dashboard, it says:

“The plugin jigoshop/jigoshop.php has been deactivated due to an error: Plugin file does not exist.”

The plug-in certainly _used_ to exist, and it worked swell–we had a few dozen products listed with prices and images. And I still see jigoshop directories in my Yahoo file manager.

So what happened? Should I reinstall Jigashop? And if I do, will I lose all my former data?

https://ww.wp.xz.cn/plugins/jigoshop/