With your installation problem, I suggest you uninstall Eraser and delete all user data (it's in the hidden AppData\Local\Eraser 6 folder of your User folder), then try a reinstall. If that doesn't work, please could you tell us which OS you are using. The issue may be with Windows Installer rather than Eraser as such.
As regards printing the Task Log, you can highlight/select all the entries (click on the first entry, then Shift-End), and then right-click to copy all to the clipboard. Paste into a temporary text file which you can print. Annoyingly, the last line of the selection will not copy; you have to copy and paste that separately.
Hope this helps.
David