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If you are looking for updated drivers for AMD HD 5450 Desktop there aren't any. The HD 5450 is considered to be "Legacy" - Non supported and obsolete.
The last drivers for both Windows x32 & x64 are from 2015 (WHQL) or BETA 2016.
You can download them from here: ATI Radeon™ HD 5450 Drivers & Support | AMD