This is a basic question, not a problem. The last version of CWIS was 4.1.1 back in 2018. Is development ongoing by the Scout team and the community? In particular, might there be future versions to cater for (inevitable) changes in PHP and MySQL.
I intend to put CWIS on a personal host to supplant my existing 'collection' of languages sites with a proper database-based catalogue, to save me coding one from scratch which would take many tens of hours.