I downloaded the 3.07.4 BETA and started the upgrade, but it keeps failing as there is insufficient disk free space on my C drive. The problem is that I cannot delete anything from that C drive, as postrgeSQL is taking most of it anyways and I cannot cancel the upgrade also, because first thing when I open PT it starts upgrading the database and don't allow me to interfere with it. After it fails, I also cannot do anything else as it either closes the programm or starts the upgrade process once more.
What should I do?