If you've downloaded the MSIX package of Affinity, you will during installation that you haven't been offered the ability to change the installation path. This is expected and is down to how MSIX packages work. All Windows Apps are installed to the default drive set in Settings > System > Storage.
There are two options to change where Affinity V2 is installed to:
- Temporarily change "Where new content is saved" by going to Settings > System > Storage > More / Advanced Storage Settings > Change where new contact is saved and select the required drive from the New apps will save to: dropdown menu. Once you've installed the app to the new drive, you can revert this setting back to Local Disk (C:)
- Move the app to a different drive once installed by going to Settings > Apps > Apps & Features selecting the Affinity App and clicking Move
Please note: It's only possible to pick the drive where you want the app installed to but not the full location. Unfortunately, this is handled by Windows and cannot be changed by the user.