Importing Client Certificate into Windows Certificate Store
On the PC, where you intend to import/install the Client Certificate from a previously downloaded or exported 'Personal Information Exchange - PKCS#12' P12 file:
Using Windows file explorer, locate the '.p12' file you downloaded/exported and double click it.
A 'Certificate Import Wizard' will appear on your screen. Select option: 'Current User' under 'Store Location' and click the 'Next' button.
Leave the certificate 'File path' unchanged and click the 'Next' button.
In the 'Password' field, enter the 'Private Key Password' you created when you enroled for (or exported) the certificate. Under the 'Import options', you may want to enable the option 'Mark this key as exportable.' and leave the other options unchanged. The private key export option will allow you to export the certificate (with the associated private key) from your current computer device and import it into another computer device - if and when needed in future. Click the 'Next' button.
Under 'Certificate Store', leave the option: 'Automatically select the certificate store based on the type of certificate' selected and click the 'Next' button.
Click the 'Finish' button. You will receive a confirmation message: 'The import was successful.' and this confirms the certificate is now installed on your computer device.