Custom themes and Blocks can't be found

Hi all,

I’m still using old RapidWeaver 4 and just had my mac repaired.

I mirrored the hard disk beforehand and now when I open up Websites to amend, it comes up with ‘Can’t find …. Theme’ and also that Blocks is missing? The themes are all custom.

Any help would be great as I don’t want to build them again.