Software: Apache. PHP/7.3.33 

uname -a: Linux acloudg.aryanict.com 4.18.0-513.9.1.lve.el8.x86_64 #1 SMP Mon Dec 4 15:01:22 UTC
2023 x86_64 

uid=1095(katebhospital) gid=1098(katebhospital) groups=1098(katebhospital) 

Safe-mode: OFF (not secure)

/var/softaculous/mantis/   drwxr-xr-x
Free 303.3 GB of 429.69 GB (70.59%)
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Viewing file:     notes.txt (1012 B)      -rw-r--r--

1. config_inc.php has additional data so add it from the previous version.
2. default admin : administrator pass : root
3. Select MySQLi as database type.
4. check edit in all aspect if there is error change where change is required 
   mantis less than 1.3.0 having default "mantis_" prefix for table
5. PHP REQUIREMENT LINK :  https://www.mantisbt.org/docs/master/en-US/Admin_Guide/html/admin.install.requirements.software.html
6. Language : if language changed from dashboard it changes for current user only and other user's language remains English. To change language for all user need to add variable in config http://www.mantisbt.org/docs/master/en-US/Admin_Guide/html-desktop/#admin.config.language
7. Keep $g_db_table_plugin_prefix and $g_db_table_suffix value to "mantis" only in manual installation to avoid confusion in table names.
8. We have asked our users to add the [[softurl]] post completing the upgrade process, check in next version if it's required or not.(Not required, checked in 2.26.3)