The easiest and safest way to install Photoshop Panels is to use the free third-party software Anastasiy’s Extension Manager.

With Anastasiy’s Extension Manager (Win/Mac)

You need admin rights for this installation. You will be asked to enter a password. If this doesn’t work, please use the manual installation guide below.

1. Download and install the free software Anastasiy’s Extension Manager (Win & Mac).
2. Download the FX-Panel from your download area and unzip it.
3. Close Adobe Photoshop.
4. Open Anastasiy’s Extension Manager and either drag the FX-Panel.zxp file into the app or hit the Install button in the menu and select FX-Panel.zxp manually.
5. Enter your system username and password.
6. You get a notification, once the installation was successful. Close Anastasiy’s Extension Manager and open Photoshop, then go to Window > Extensions > FX-Panel.

Step-by-Step manual installation guide (Win/Mac)

Manuell installation will work without admin rights. But if you want to add scripts (step 8 + 9), you do need to have them. The FX-Panel will work flawlessly, even without those scripts. But they are necessary if you want to use global shortcuts.

1. Download the FX-Panel from your download area and unzip it.
2. Close Adobe Photoshop.
3. Rename the FX-Panel.zxp to FX-Panel.zip.
4. Unzip the FX-Panel.zip file. You get a couple of files and folders. Two folders are important: HTML and SCRIPT.
5. In the HTML folder, there is another FX-Panel.zxp file. You should be able to install this file with Anastasiy’s Extension Manager, even without admin rights. If you succeed, continue with step 8.
6. If Anastasiy’s Extension Manager still didn’t work, rename the FX-Panel.zxp to FX-Panel.zip and unzip it. You get an FX-Panel folder. You need this folder for the next step.
7. Copy the FX-Panel folder from step 6 to the Adobe Extensions location (see path below). The FX-Panel is now installed.
8. Navigate to the Photoshop Scripts location (see path below) and create a new folder “FX-Panel”.
9. Copy the files from the SCRIPTS folder (from step 4) to the FX-Panel folder from step 8 (Photoshop Scripts location).
10. Open Photoshop, then go to Window > Extensions > FX-Panel.

Adobe Extensions Location: 
MAC: ~/Library/Application Support/Adobe/CEP/extensions (admin rights)
MAC: ~/Users/username/Library/Application Support/Adobe/CEP/extensions (no admin rights)
WIN: C:\Program Files (x86)\Common Files\Adobe\CEP\extensions
In case the "extensions" folder doesn't exist, just to create it.

Photoshop Scripts Location (admin rights): 
MAC: ~/Applications/Adobe Photoshop CC xxxx/Presets/Scripts
WIN: C:\Program Files\Adobe\Adobe Photoshop CC xxxx\Presets\Scripts
xxxx = Photoshop version