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You need to turn strict off in your php.ini file.
The install program hasn't been updated like the rest of the program has been and will throw those errors if you do not turn it off.
remember 2.6 is ALPHA, this means test it only, do NOT use it for your site. Use 2.5.5 if you are installing on your site but you still have to turn off the strict reporting.
You probably have a line in your php.ini file similar to the following.
error_reporting = E_ALL | E_STRICT
Make it look like this:
error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
And reminder, if this is a site others are using do NOT use 2.6. Use 2.5.5
Attending College working towards Bachelors in Software Engineering and Network Security.