Before you install the plug-in filters,

 you will need to download and install MSVCRT10.DLL

to your Windows/System file.

A few filters also needs the file PLUGIN.DLL

in the Windows/System directory to run.

Plug-ins that are compatible with Paint Shop Pro
are those in the .8bf file format.
Several sites such as the Filter Factory Filters
are in a different file format.
You will need the Plug-in Commander (PiCo) to convert these filters.
Once you have installed the msvcrt10.dll (and plugin.dll) file's),
you will need to create a folder in your C: directory to install filters in.
If you intend on adding many plug-in filters,
you will find that they will not all work if they are in the same folder.
We recommend that you set us a directory called plug-ins
and have a few sub-directories
in that folder to add plug-ins to.
The directory should look something
like this should look something like this:

1 Unzip the filters to the plug-in folder you created
2 Open Paint Shop Pro.
3 CLICK on FILE PREFERENCES >
GENERAL PROGRAM PREFERENCES.
Click File->Preferences->File Locations
4 Click on the Plug-in Filters tab.
5 Click on Browse, find the Plug-in directory and click on it.
look at the screenshots below

6 Click Select.
7 Click OK.
8 Close Paint Shop Pro and then open it again.
9 Open any image in Paint Shop Pro that is 16 million colours.
10 Click on Image->Plug-in Filters (prefs) or Effects->Plug-in (A, B, & C),
11 you will see the filters you installed shown there,
select one and use it on your image.
 

Try  This One To Get You Started

C:\Program Files\Jasc Software Inc\Paint Shop Pro 7\plug-in
click OK
if located on other drive
just change drive letter the path will be same
open your psp load a picture go to effects
plug in filters select Eye candy 3.01
then use this serial to register it
Eye Candy Serial Number IIIGEBFHMJNB
the same idea applies to installing most filters
and YOU ARE DONE!