Missing Content in Halion Sonic SE

Recently had a bad crash that reduced my PC to only booting to the UEFI. I did have backups and system images with Acronis but now cannot get Acronis to work but that’s another story.

I reinstalled Cubase 11 Pro onto my C drive and decided to copy the downloads to another drive. Think I must have moved not copied. I now find Halion Sonic SE opens with a “no entry” sign and the content is missing. Tried a reinstall but no improvement. Tried Find Missing Files but it is just greyed out.

Any ideas please?