1. Open xampp site https://www.apachefriends.org/
2. Click on download other versions > Select more version
3. Download your the version you want in zip format (and un zip)
4. Stop xampp (apachi and mysql) and Go to your old xampp
5. rename apachi folder and php folder and copy only these two folders from unzip folder
6. open new php folder > open php.ini file in editer
7. search: extension_dir = "xamppphpext"
8. replace: extension_dir = "C:xamppphpext"
9. start your xampp and check php -v