The libraries we have shared since June were produced in 8 as 8 versions were published. There is no library support for backward versions. At the link
"Plants- flowers, 3D people, cars You can download and use the 171 new libraries consisting of wrought irons and hospital equipment from the links below. (Only wrought iron and hospital equipment package can be used in version 7.)"" description is included. New libraries to be added can be opened in current versions.
You said that only wrought iron and hospital equipment package can be used in version 7, but I could not load only human characters, I opened the others in 7 versions..for your information.