I don't believe it is currently possible to get a specific row index in the condition evaluations. As a workaround, you could add a hidden field for each row, then use a Function to assign the value from the associated row index. Then you can evaluate those fields instead to get the results you want.

For example, if you had 3 rows, you would create 3 hidden fields and use the following function in the Advanced tab for the new fields (replace the table and column names with those from your table)

=INDEX(Table.Column,1)

=INDEX(Table.Column,2)

=INDEX(Table.Column,3)

Make sure the fields are set to save the values even when hidden. The function will automatically update the value when the associated row/column changes, and that will give you a variable you can access in the conditional outflows.

UPDATE: As of 10.2.1 there's apparently an option to apply indexes to table variables.

For example, when you have multiple file uploads in a collection, you can link them to a field from the corresponding row in the save to repository task, like so 

{dataset/table/column[Row()]}

However, I tested and it does not appear to work in gateway conditions (yet).

https://answers.laserfiche.com/questions/88482/In-Forms-10-are-you-able-to-relate-field-values-to-a-file-upload-in-a-given-row?sort=newest