I was talking about the retention of your current files on 3.4.9, which you mentioned you are upgrading from.
I am sorry to hear you are leaving us. Please understand, you are upgrading from a version which is now quite old. We supported that for quite some time, however at some point it becomes unviable to do this. The reality is you are migrating from software that was released well over a decade ago. We provided support for this up to January 2022, which gave people a considerable amount of time for a supported migration from the 3.x versions (approximately 8 years). In this time, there have been major changes in PHP versions, MySQL releases and more.
With regard to older versions of 4.x, we don't provide old insecure releases. If you wish to upgrade, it will need to be done on the latest release. There is still a fair few who do this, so the complexity appears to be only in your own release. Sorry I could not be of more help here and I do hope that someone from our community is able to assist you should you wish to continue trying.