I downloaded time sheet version "mod.timesheet.v2.1.zip".

Appreciate some of your advice regarding mod.timesheet.v2.1.zip compatibility with Sugar Community version 5.1.

1) Is mod.timesheet.v2.1.zip stable version for 5.1 or is there are any other stable versions available ?
2) suppose I installed mod.timesheet.v2.1.zip on 5.1 is it possible to rollback ?