How to update to Asynx Planetarium v2.61 ?
You can keep your old installation and just install a new version as long as they have different release numbers.
If you just like to use the new version then:
Deinstall your old program version and install the new:
1. Go to START->Settings->Control Panel->Add/Remove Programs.
2. Search for the old version and click the "Change/Remove" button.
3. Download and install Asynx Planetarium v2.61.