Hello Igor,
Many thanks for your quick response. I downloaded the special uninstaller and ran it, the program appears to have corrected itself without running PTE Studio again. I was expecting to have to do a new download but this has not been the case. The important thing is that the program is now working as expected. The new licence key supplied purchased 15 2 23 is now not being recognised when I try to activate it although it was recognised on the "corrupt " download. I have the evaluation version only.
Kind regards,
John.