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What are the steps to downgrade a typo3 site and is this even possible?

I cannot get a few plugins to work on my 7.4 typo site so I decided to downgrade but I cannot find anything about it on typo forums or in the documentation. Are there any steps I can follow if this is possible.

RDAxRoadkill
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2 Answers2

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Before upgrading your website you should always backup your data and avoid downgrading at any time.

Compatibility mode for TYPO3 6.x

The system extension compatibility6 is shipped with TYPO3 7, have you tried installing this extension already?

See also: Retaining compatibility to TYPO3 CMS 6

Downgrading from 7.x back to 6.2

There is no such thing as a documentation with downgrade instructions. But if you have no other option than you can try the following:

Before running TYPO3 again:

  1. Backup your data
  2. Remove the TYPO3 7 core as well the composer.json (and /vendor/ directory), .htaccess and index.php file from your website.
  3. Remove the content of /typo3temp/, /fileadmin/_processed/ and /fileadmin/_temp_/.
  4. uninstall all TYPO3 7 related (system) extensions by setting the state to inactive in the /typo3conf/PackagesStates.php file.
  5. Uninstall or downgrade all extensions which are only compatible with TYPO3 7.x.
  6. Set manual the ['SYS']['compat_version'] in /typo3conf/LocalConfiguration.php to '6.0' (we let TYPO3 think that we are uograding from 6.0. Please note that TYPO3 7 doesn't have this option anymore and you need to create it yourself.
  7. Remove all array items from the array ['INSTALL']['wizardDone'] in /typo3conf/PackagesStates.php.
  8. Set manual options such as ['FE']['activateContentAdapter'] back if needed.
  9. Put the TYPO3 6.2 core back in it's place.

Now you're allowed to run TYPO3 again:

  1. Log in on the install tool by accessing /typo3/install/.
  2. Run the database compare but please don't remove fields or tables that belongs to extensions which you have temporary disabled for downgrading purposes.
  3. Clear all caches from the install tool.
  4. Run al steps from the upgrade wizard.
  5. Reactivate disabled extensions (manually).
  6. Check if the ['SYS']['compat_version'] is set to '6.2'.
  7. Test your TYPO3 instance as good as you can.
Arek van Schaijk
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  • Yes I have an backup, but I did not want to go through the process of adding files of the backup again. I have to update typo3 4.0 to 6.2, wich will probably not be without any issues. I will try to install the extension my main problem is templavoila not working. thank you for the quick response I will keep updating my question/progress. – RDAxRoadkill Oct 05 '15 at 14:15
  • After installing the compatibilty plugin I came across this issue `Calculated absolute path to typo3/sysext directory does not exist.` would you know what this means? – RDAxRoadkill Oct 05 '15 at 14:26
  • I can't support you from here with resolving different issues you'll face when enabling the `compatibility6` extension. Your question is about downgrading from `7.4` to `6.2` and this is my best answer I can give. – Arek van Schaijk Oct 05 '15 at 17:06
  • I suppose that is true I shall ask this in another question. Thank you for your help – RDAxRoadkill Oct 06 '15 at 07:20
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Arek van Schaijk solution worked to downgrade 8.7 to 7.6. But a couple of additional changes might require.

  1. in the file

typo3/sysext/core/Configuration/DefaultConfiguration.php

  • change fileCreateMask from 0664 to 0660

  • change folderCreateMask from 2775 to 2770

    1. Symbolic links can be rectified with this solution.
Kiran K Telukunta
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