Kathleen,
Not sure why you were forced to update , unlike WordPress , Store Locator Plus NEVER auto updates. If you did update SLP to version 5.0, did you also update the Power add-on?
You have not provided enough information or acreenshot of your plugin environment for me to be able to see what versions you have. (see posting guidelines)
. The sidebar under StoreLocatorPlus would not show SEO Pages unless you have Enable Pages checked off, under general/Server. Perhaps that was reset, there was an issue with that in one of the previous versions.
Please refer to:
https://docs.storelocatorplus.com/blog/enable-pages-setting/
Also some information about Manual vs auto updates and settings being undone. How to prevent this:
https://www.storelocatorplus.com/manually-updating-wordpress-plugins/