Forgive my lack of knowledge but..

[toolman.co.uk]

.. [simple one this] Can I delete my previous version of actinic from my computer now I have V10?

[Duncan Rounding]

If you no longer need your previous version to refer to and your upgrade is complete - then yes. Make a compete backup of the previous install first though.

If you have purchased an upgrade then your previous version should be retired and not used on an online store again.