Yes, the update is free whether you are updating from TableEDU 9 or from a previous version as long as your hardware is compatible.
The recommended GPU is RTX 1070 or higher which applies to most units shipped after 2016.
TableEDU and TableAlpha are different versions of the Table software. The Table 10 update is only available for TableEDU at this time and you will be notified via email once TableAlpha is available.