It seems like you are encountering an issue with the maximum index length in MySQL, which can be affected by the storage engine and character set being used. Here are some steps you can take to resolve this issue:

Check the Character Set and Collation:
Ensure that the character set and collation of your database and table are the same as the source. The error might be caused by differences in character set and collation settings, which affect the maximum length of indexed columns.

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SHOW VARIABLES LIKE 'character_set%';
SHOW VARIABLES LIKE 'collation%';
Compare the values on both the source and destination databases.

Adjust the Index Length:
If the character set is utf8mb4, each character can take up to 4 bytes, which reduces the maximum length of an indexed column. For utf8mb4, the maximum length of a varchar index is 191 characters.

You can modify the index length to fit within the limit:

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ALTER TABLE kunena_aliases DROP INDEX index_name;
ALTER TABLE kunena_aliases ADD INDEX (column_name(191));
Adjust the length to 191 or less to ensure compatibility.

Check the MySQL Configuration:
Some MySQL settings might differ between the accounts, causing this issue. Specifically, check the innodb_large_prefix setting, which allows longer index prefixes for InnoDB tables.

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SHOW VARIABLES LIKE 'innodb_large_prefix';
If it's set to OFF, you might need to enable it:

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SET GLOBAL innodb_large_prefix = 'ON';
Also, ensure that innodb_file_format is set to Barracuda and innodb_file_per_table is enabled:

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SHOW VARIABLES LIKE 'innodb_file_format';
SHOW VARIABLES LIKE 'innodb_file_per_table';
If necessary, you can set these values in your MySQL configuration file (my.cnf or my.ini):

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[mysqld]
innodb_file_format = Barracuda
innodb_file_per_table = 1
innodb_large_prefix = 1
Split the Table Export and Import:
Export the kunena_aliases table separately and import it using a tool that can handle large indexes more gracefully, such as MySQL Workbench or phpMyAdmin.

Temporary Change the Column Type:
You mentioned changing the column type to a smaller varchar length, which allowed the import. After the import, you can try to alter the table structure to revert to the original length, but ensure the index length is within limits:

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ALTER TABLE kunena_aliases MODIFY column_name VARCHAR(255);
ALTER TABLE kunena_aliases DROP INDEX index_name;
ALTER TABLE kunena_aliases ADD INDEX (column_name(191));
Backup and Restore with Akeeba:
Ensure that Akeeba Backup is configured to handle large tables and indexes. Check the backup settings for any options related to database handling, and adjust them if necessary.

If none of these solutions resolve the issue, you might need to contact your hosting provider to ensure there are no hidden differences in the MySQL configurations between the two accounts. They might also be able to provide additional insights or adjust the necessary settings to allow the import to proceed without issues.

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