Question What if I need to reinstall my operating system ?
  Nothing.

Question How long can I use this unregistered version?
 

7 days. 


Question If I purchase Pregnancy Calendar how long can I use it ?
  Registered users of Pregnancy Calendar are immediately eligible for lifetime upgrades and support. Once you purchase Pregnancy Calendar you can use it for as long as you like and if a new version is released you can get
that too. Nothing more to pay ever.

Question If I buy Pregnancy Calendar, how many computers can I install it on ?
  Registered users of Pregnancy Calendar are allowed to install the program on only 1 computer.