Unzip the downloades package and upload the contents through ftp to your packages folder. Now Login your site and go to the dashboard. Find the extensions tab and click the migration package to install.

I haven't tried the latest update yet, but the vrevious version of migration tool didn't work for me. I got imports with empty imagepaths on 5.7.5.7.

Hope the bug is solved!

Oh and i think you have to rename the migration package folder to migration_tool instead of migration_tool_master. But i can look that up for you later.

Hi buurvrouw, thanks for helping out.
I had already uploaded to 'packages' but didn't re-name.
I have now renamed from 'addon_migration_tool-master' to 'migration_tool', but nothing is showing in 'Extend Concrete5' in the dashboard.

I'm trying this on 5.7.3.1 so wondering if the renaming is wrong or if i need another version of the tool?

Ignore last message. Looking again, logic has prevailed.
You have to unzip the download and then look inside the expanded folders to find the actual tool inside the 'packages' folder in the download which is then labeled 'migration_tool'.

Screen shot attached to explain to others.

Now I can see the install.

Ah great! Good luck migrating :-)

thanks but disaster has struck.

Migration tool only works above certain level of 5.7.5 or above.
My site was on 5.7.3 so upgraded to 5.7.4 without a problem.
Then tried to go to 5.75 and lost the whole site!

Oh dear! Most of the times you can simply convert back to the previous version by editing the /application/config/update file. Did you do a dashboard update or a manual update?

i did a dashboard update.
I then went herehttp://fishingjersey.co.uk/index.php/ccm/system/upgrade... and clicked 'upgrade' and got this:

An exception occurred while executing 'select CollectionVersionBlocks.isOriginal, CollectionVersionBlocks.cbIncludeAll, Blocks.btCachedBlockRecord, BlockTypes.pkgID, CollectionVersionBlocks.cbOverrideAreaPermissions, CollectionVersionBlocks.cbOverrideBlockTypeCacheSettings, CollectionVersionBlocks.cbOverrideBlockTypeContainerSettings, CollectionVersionBlocks.cbEnableBlockContainer, CollectionVersionBlocks.cbDisplayOrder, Blocks.bIsActive, Blocks.bID, Blocks.btID, bName, bDateAdded, bDateModified, bFilename, btHandle, Blocks.uID from CollectionVersionBlocks inner join Blocks on (CollectionVersionBlocks.bID = Blocks.bID) inner join BlockTypes on (Blocks.btID = BlockTypes.btID) where CollectionVersionBlocks.arHandle = ? and CollectionVersionBlocks.cID = ? and (CollectionVersionBlocks.cvID = ? or CollectionVersionBlocks.cbIncludeAll=1) and CollectionVersionBlocks.bID = ?' with params ["Header", "1", "91", "551"]: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'CollectionVersionBlocks.cbOverrideBlockTypeContainerSettings' in 'field list'

You can try to run the update a second time like this:
<yoursite>/index.php/tools/required/upgrade

Have you tried to empty the application/files/cache/ folder?
Or maybe some overiding block is playing bad. Make a backup of your block overrides and empty them on the server-side to check and see.

impresses with your knowledge!

I cant get access to the dashboard now, but have emptied cache via FTP with no change.
Not sure hoe to do the block thing you mentioned, but if it is a block can i just delete the blocks folder?

Ah no, my knowledge is not that big. Just giving you direction in what have caused errors for myself in previous situations.

And no, do not delete the blocks folder!

You have a folder /application/blocks/
All files in this folder are overrides on the core blocks. If you have overrides they sometimes cause problems with updates. So make sure it's not an override just temporarily remove the folders inside of this /application/blocks/ folder. Make sure to back up and place them back if this does not solve your errors.

Maybe you can find an answer in this thread:https://www.concrete5.org/community/forums/installation/upgrade-to-5...

tried /application/blocks/ removal but no change.
your link doesn't go anywhere by the way.

I do really appreciate your help with this, but I think i'm going to have to 'bite the bullet' and rebuild from scratch which is a real pain as it was the largest site I have built with hundred of images and captions for each.

No don't throw it away yet. Do some searches in the forum for errors with upgrading from 5.7.4 to 5.7.5.
I'm sure there are some people here that can help you out. Maybe change the post title to something to do with upgrade problem so people know this is not about migration anymore.