In Edit/Preferences turn off all automatic checking by Pretty Print or HTML Tidy.
I suggest you ignore HTML Tidy completely. If you want to tidy up a file with Pretty Print, r-click in Code View and select Reformat HTML:Clean Source.
Unless you take special steps to install in different directories, 0.7.1 will over-write 0.6.2. I suggest you let it. The only notable bug in 0.7.1 is a problem on some systems with docking floating windows like Preview. It's a tiny inconvenience.
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