If you notice the folder is named plupload1. It shouldn’t have the 1 after it. Just /plupload.

If you can ftp in (or get to the File manager) and remove the 1 you should be good to go.

And just out of curiosity… Did you upload plupload1.zip or plupload.zip?

I see what you mean – thank you. Trouble is, I can’t seem to even find the plugin in my file manager for this… The file on my desktop reads plupload.zip, but I must have downloaded the plugin twice and uploaded the wrong one. Any advice on where I can find this file in my file manager? I get as far down as the Simple Press folder and then can’t seem to find the plugins.

In most cases the plugins for Simple:Press are located in /wp-content/sp-resources/forum-plugins

That is not a requirement though. You can go to your Forum Admin in the WP backend and then go to Integration – Storage Locations and it will show you the folder the SP plugins are located in.

Unfortunately I cannot access anything on the backend. Every time I click on any page it gives me the same error. Thanks so much for your help. I’ll keep trying to locate the file.

You will need to get in via FTP or your control panels file manager to rename.
Once you do let us know if that takes care of it.

Found it! Thank you so much for your help!

good deal.  thanks for update.