it's possible to upgrade from old version to new from bash install new one ?

Ubuntu 18.04.4/Apache

Package python3-dnspython is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package python3-jinja2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package python3-simplejson is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3-simplejson' has no installation candidate
E: Package 'python3-dnspython' has no installation candidate
E: Package 'python3-jinja2' has no installation candidate
Package installation failed, please check console output and fix it manually.
upgrade_iredadmin.sh: line 742: exist: command not found
upgrade_iredadmin.sh: line 747: /usr/bin/pip3: No such file or directory
Package installation failed, please check console output and fix it manually.
upgrade_iredadmin.sh: line 750: exist: command not found
* Check SQL tables, and add missed ones - if there's any
* Replace py2 by py3 in cron jobs.
* Clean up.
Traceback (most recent call last):
  File "delete_sessions.py", line 9, in <module>
    import web
ModuleNotFoundError: No module named 'web'
* iRedAdmin has been successfully upgraded.
* Restarting apache2 service.
* Enable service: iredadmin
Created symlink /etc/systemd/system/multi-user.target.wants/iredadmin.service -> /lib/systemd/system/iredadmin.service.
* Upgrading completed.

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====