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how to upgrade concrete 5.4.2.2 to concrete 8.2.1

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I have a client that is currently using concrete 5.4.2.2 but he needs to update to concrete 8.2.1 in order to be able to install newest themes.

how to upgrade concrete 5.4.2.2 to concrete 8.2.1 ?
 
MrKDilkington replied on at Permalink Reply
MrKDilkington
Hi yucuninu,

I believe you will need to upgrade to 5.6 (possibly in steps) and then migrate to version 8. There is a migration tool available for the migration.
https://www.concrete5.org/community/forums/customizing_c5/5.6-to-5.7...

Custom code, add-ons, and blocks need to be compatible with v8, so some code updating will be required.
yucuninu replied on at Permalink Reply
Hi thank so much for your answer.
hutman replied on at Permalink Reply
hutman
Depending on the size of the site and the number of custom features it might be faster to just start over again and just manually migrate content.

As MrKDilkington said there is a tool if you get upgraded to 5.6.3.5 (you'll need to upgrade to 5.5.0, 5.6.0, 5.6.3, 5.6.3.5 in between). Then you'll have to use the migration tool and manually upgrade any custom features.