I have a scenario where the application has inserted data into the Cassandra table with a (TTL) of 5 days.I also have (GC\_GRACE\_SECONDS) to 5 days so that tombstones will get evicted as soon as compaction kicks in. 

Now, i have a scenario where for one table i need to keep data for 60 days. I have changed the application write to update the TTL to 60 days for the new Data. But I'm looking for a solution where i could change the TTL for existing data(which has 5 days to 60 Days).

I have tried Instaclustr/TTLRemover for some reason the code didn't work for us.
We are using Apache Cassandra 3.11.3.