There have been so many recent updates, things have gotten a little confusing. To fix this, I've added version numbers (1, 2, 3... etc.) to the product names. These correspond to major changes in the software and should help you determine if you need to download a new version.
Here's the basic system:
GBTimelapse 3: EOS Versions 1.0.0 and above
GBTimelapse 2: PowerShot/EOS Versions 2.2.7 through 2.2.11 (Discontinued)
GBTimelapse 1: PowerShot/EOS Versions 1.0.0 through 2.2.6 (Discontinued)
GBDeflicker 1: Plugin for Adobe CS4, version 1.0.0 through 1.x.x
GBDeflicker 2: 64-bit Plugin for Adobe CS5 and CS5.5, version 2.0.0 through 2.x.x
GBResequence 1: Version 1.0.0 through 1.x.x
Your purchased serail number is valid for any new version with the same major version number. For example, if you bought GBDeflicker 2, you can download and install any new release with version number 2.x.x
I hope this will make revisions and upgrades more clear.