The version 3.x has some significant changes , both in user interface and in toolpath logic . More info here : What's new in version 3.
So it's a good idea test deeply the new version . The files created with v3.x can't be opened with v2.x , so consider do a backup file before opening with new version.
If you want to upgrade from version 2.x to 3.x ( adaptive module not included) , here the pricing :
Pro Version purchased after 01/03/2017 - 50% Discount -
Hobby version - Price difference between purchased package and desidered package
Adaptive Roughing Module - Full net price ( 150 € )
If interested in license upgrade , send me your payment receipt , current activation code and machine id .