If I were you, however, I would consider this as a chance to "clean up" things a bit and would do a completely new install of the UCCX and manually migrate all scripts etc. At least I would see how much garbage data has been accumulated over the years which are unnecessary to migrate.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...