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Topic: Upgrade iRedMail from 1.4.2 to 1.5.2

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.4.2
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No, but purchased
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
For iRedAdmin-Pro latest version we need iRedMail 1.5.2. In tutorial for upgrading wrote: "Do NOT skip releases". How can I download iRedMail 1.5.0 and 1.5.1?

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team.

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Re: Upgrade iRedMail from 1.4.2 to 1.5.2

- For iRedMail, please read the "How upgrading works" section here: https://docs.iredmail.org/iredmail.releases.html
- For iRedAdmin-Pro, AFTER you have the latest iRedMail release running, it's ok to upgrade from old release to the latest release directly and skip releases between current and latest releases.