As a long-time WebAssist extension user it just drives me crazy that you all think all the installation bugs for all the extensions I use (validation toolkit, cookies, HTML editor) are just a matter of, well you know, just uninstall every extension and then reinstall them all, is like, you know, well... just like a drive around the park.  
You might want to consider the possibility that there is an issue with your system. Others are having a different experience:
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