can anyone send me their standard edition license.dat file for quartus 64 bit edition (*floating license) ?

Here you are not going to get license file.

Use quartus lite edition which is free, If you can't afford license for std or pro.

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https://www.intel.com/content/www/us/en/programmable/quartushelp/15.1/index.htm#reference/glossary/def_dat.htm

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https://www.intel.com/content/www/us/en/programmable/support/support-resources/download/licensing/overview.htm

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actually i heard someone is changing to pro edition so the standard edition license is of no use him right , so i want license from them .

You're not going to get a license here. Besides, a fixed license is attached to a MAC address of the machine it's running on.