help DB

hello? i have backup DB from sql server 2019 and i try to Setup the DB from sql server 2019 to SQL server 2008 r2 but have Error like this "Specified cast is not valid. (sqlmagerUI)" maybe Sql Server 2008 r2 is not compatible to Backup DB from sql 2019?

https://i.postimg.cc/m2k2K1Qd/what-error.png

u can't do that, u can restore the original database .bak maybe but not the one you see this error, ofcourse is not compatible! even if you try sql 2012 it will not work.. and who gives 2019 DB? what files are those...