I'm trying to install the plugins Multilingual CMS and String Translation, but apparently, it fails under the error "Could not copy file. (sitepress-multilingual-cms/locale/po/sitepress-he_IL.po)".
I was able to install WPForms Multilingual, but not those, so I don't know exactly what is causing that problem.
Also, since I can't install it, I can't provide my debug info.
This could be caused by multiple reasons including server settings.
Can you please try the following steps and see if that works fine?
1. Create a full website backup
2. Disable and delete WPML + the WPML String Translation add-on
3. Download them manually straight from our site here: https://wpml.org/account/downloads/ (click the button below so that you can manually download the zip file)
4. Then go to Plugins > Add new > Upload > and upload the zip file and see if you are able to properly install the latest WPML version. Then, install the "String Translation" add-on.
5. If everything works fine, then go to Plugins > Add new > Commercial > and try to register WPML again in case it shows up as UNREGISTERED