If I download the latest version; what will happen with my work? The way you suggest to do it on the mail recieved today will sustitute the actual desktop version for a new one...
The actual desktop version will be replaced with a new one but none of your previously created work will be affected and you will be able to use the new version to edit your previously created projects.
I recently purchased the 1 year subscription, is the program the same comparing to the life time license purchase?
Yes, the software is exactly the same. The One-off licence just means you do not pay any subscription fees; just one payment up front.