First let me mention, that all presets bundled with Forest Pack will be overwritten during reinstallation / upgrade. For this reason we don't recommend saving any of your custom / edited styles inside of this library (C:\Program Files (x86)\Itoo Software\Forest Pack Pro\lib and use for this purposes User's Libraries. In the Library Browser interface by going to File - Preferences... you can access the Library Browser Options where under Library Paths you can manage folders used for saving your custom styles.
The same is applicable to the HQ Catalog - we highly don't recommend saving any data inside of the C:\Program Files (x86)\Itoo Software\HQ Plants Catalog\lib folder. When HQPlants Libraries window pops up, map the path to your files by pressing Select installation Path button. You should select the corresponding folder where you unpacked your HQ models (it can be unpacked "anywhere" on your local / external / shared drive).