Review the Release Notes of the different versions of Aspire 5 here.
Aspire 5.0
Aspire 5.0.1
Aspire 5.0.2
Aspire 5.0.3
Aspire 5.0.4
Aspire 5.1
Aspire 5.1.1
Aspire 5.2
Aspire 5.2.1
Aspire 5.2.2