If you have this problem, it could be php has not enough memory to clone completely your installation.
I had this problem with one of my Prestashop installation which was 7.5GB.
You simply need to change the value memory_limit in the files:
- Restart the server
Usually, the value of memory_limit would be « 64M ». Try to change it to « 256M »
Note: if you use cPanel, you need to change this file:
- Restart server
Source of the note: https://www.softaculous.com/board/index.php?tid=10429&title=WP_Clone_stuck_at_95%