Untar the backup file, locate the backup info file which has the same name as the backup file without any file extensions.

Update the below values in the backup info file:
softpath, path, softdb, softdbuser, softurl, softdomain

>>Could you tell me where to find the serialization count and how to update it?
Below is an example of updating the serialization count of the softpath
old softpath: s:8:"softpath";s:22:"/home/soft/public_html";
new softpath: s:8:"softpath";s:29:"/home/softaculous/public_html";

Serialization count refers to the number of characters, the count needs to be updated when the values are updated/changed.