It will install to another directory so as long as you do the "Reset to defaults" under "Settings" in your old version, or manually delete the Kixtarter key under "HKey_Current_Users" you should be able to install side by side, and technically other then having to resize the forms, run both version when you want. The main difference is VB6 did sizes in twips, which was a odd number like a maximized window at 1024x768 in twips was 14000x10000 or something. VB.Net uses pixels, so if you run the beta and close it, then run the old version the size will be real small.

Allan.
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Kixtarter - KiXtart Script Editor
http://www.AllanDynes.com/