Tweak Prestashop database to work with shop

I have a Prestashop installation of an older version which was working until there were issues with the domain name. Someone moved the shop to another domain. I need to make it work again on the original domain, original installation, everything as it was in the first place. The database is still there and the original PrestaShop files are in the original location unchanged. The database has been edited somehow (in an attempt to make it work with an installation of PrestaShop on another domain). This should be a few minutes' work for someone who knows PrestaShop's internal settings well for an OLDER VERSION. I do not want to upgrade, only get the shop working again as it was in December before a certain hosting company did bad things with my domain registration.