Affects of Opening Captivate 6 file with Captivate 8

My company is currently running Captivate 8. I have some older files from Captivate 6 that I need to maintain for a customer. What kinds of ill affects may I encounter when upgrading those files to Captivate 8? Will I have the same functionality? Will I need to fix a lot of my interactions?

Thanks,

-Josh