Hi pompel 4, and welcome to the iClone side of the house.
First the answers to the easy questions.
You should have received a mail with the serial numbers for your products - they are required during installation. You can have them sent to you by selecting the products on your member page and clicking on resend serial nr.
We have been reliably informed from the highest levels that 3DXchange 5 can be used to convert models for use in iClone 6 - it can not be used to export anything from iClone 6.
And now for the hard question - to learn or not to learn?
If you take a read at the posts in this section you will see that iClone 6 will come with a new GUI and a whole bunch of new features. However getting the hang of adding items to a scene, applying motions to an avatar, moving and resizing objects in 3D space should help you get up to speed when ver. 6 is released.
Every new version of iClone has presented long time users with challenges, but a lot of the basics remain the same - and makes learning the new tools some what easier.
"Playing around" with iClone 5 while waiting for iClone 6 can only make things more fun - and there's a great bunch of people here only too willing to help you get up and running.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.