HotFixes

Hot-Fix patch files are made available to address specific issues in releases. Please be sure to only apply patches that are valid for the version of WHMCS you have installed. Instructions to apply the fix may vary from case to case. Please read in full.

Looking for Version 7?
Hotfixes for version 7.0 and above are located here: https://whmcs.community/files/categories/

Version 6.3.0

CORE-9907 - Prevent fatal error on domain renewal
Full Details: http://forum.whmcs.com/showthread.php?112798
Steps to Apply: Upload the single file contained within the zip folder to the includes directory
Download Link: http://www.whmcs.com/download/842/prevent-fatal-error-on-domain-renewal

Version 5.3.12

CORE-8348 - Prevent Email Reopening rendering incorrectly in General Settings when enabled
Full Details: http://forum.whmcs.com/showthread.php?98506
Steps to Apply: Upload the single file contained within the zip folder to the admin directory
Download Link: http://www.whmcs.com/download/694/render-prevent-email-reopening-correctly

CORE-8351 - Domain renewal email template days until nextdue merge field always zero
Full Details: http://forum.whmcs.com/showthread.php?98503
Steps to Apply: Upload the single file contained within the zip folder to the includes directory
Download Link: http://www.whmcs.com/download/690/domain-days-until-nextdue

Version 5.3.10

Case 5197 - Can't access admin area in Windows environments
Full Details: http://forum.whmcs.com/showthread.php?93382
Steps to Apply: Upload the single file contained within the zip folder to the root directory
Download Link: http://www.whmcs.com/download/666/windows-admin-directory-fix

Version 5.3.9

Case 5077 - Two-Factor Auth redirecting to Admin Login for 5.3.9
Full Details: http://forum.whmcs.com/showthread.php?92550
Steps to Apply: Upload the single file contained within the zip folder to the admin directory
Download Link: http://www.whmcs.com/download/650/admin-two-factor-first-login-fix

Version 5.3.6

Case 4339 - Email CSS Styling not applying
Steps to Apply: Upload the single file contained within the zip folder to /includes/classes/WHMCS/
Download Link: http://www.whmcs.com/download/610/email-css-styling-fix

Version 5.3.4

Case 4116 - Doman Registration Fix
Steps to Apply: Upload the files as set out within the zip folder to your root WHMCS directory
Download Link: http://www.whmcs.com/download/582/domains-reg-fix

Version 5.3.3

Case 4061 - WorldPay Callback Fix
Steps to Apply: Upload the single file contained within the zip file to the /modules/gateways/callback/ folder
Download Link: http://www.whmcs.com/download/566/worldpay-callback-fix

Case 4016 - Gateway Parameters Fix
Full Details: http://forum.whmcs.com/showthread.php?85218
Steps to Apply: Upload the single file contained within the zip file to the /includes/classes/WHMCS/ folder
Download Link: http://www.whmcs.com/download/562/gateway-params-fix

Version 5.2.13

Case 3663 - Client Area Currency Switching Problem
Full Details: http://forum.whmcs.com/showthread.php?81910
Steps to Apply: Upload the single file contained within the zip file to the /includes/ folder
Download Link: http://www.whmcs.com/download/490/currency-switching-hotfix-52

Case 3671 - Insert Predefined Reply in Admin Open Ticket not working
Full Details: http://forum.whmcs.com/showthread.php?81990
Steps to Apply: Upload the single file contained within the zip file to the /admin/ folder
Download Link: http://www.whmcs.com/download/494/admin-new-ticket-predefined-52

Case 3672 -  Add Predefined Product in Quotes not working
Full Details: Clicking the Add a Predefined Product link when creating or editing a quote leads to an invalid token error
Steps to Apply: Upload the single file contained within the zip file to the /admin/ folder
Download Link: http://www.whmcs.com/download/498/admin-quotes-predefined-product-52

Version 5.2.12

Case 3471 - Ticket Attachment Downloads Fail in First Ticket Message (Does not affect replies)
Full Details: http://forum.whmcs.com/showthread.php?80718&p=344703#post344703
Steps to Apply: Upload the single file contained within the zip file to the root WHMCS directory
Download Link: http://www.whmcs.com/download/506/ticket-attachments-download-52

Version 5.1.14

Case 3663 - Client Area Currency Switching Problem
Full Details: http://forum.whmcs.com/showthread.php?81910
Steps to Apply: Upload the single file contained within the zip file to the /includes/ folder
Download Link: http://www.whmcs.com/download/502/currency-switching-hotfix-51

Version 5.1.13

Case 3471 - Ticket Attachment Downloads Fail in First Ticket Message (Does not affect replies)
Full Details: http://forum.whmcs.com/showthread.php?80718&p=344703#post344703
Steps to Apply: Upload the single file contained within the zip file to the root WHMCS directory
Download Link: http://www.whmcs.com/download/510/ticket-attachments-download-51

Version Independent

Case 3706 - Google Graphs API Object Error
Full Details: http://forum.whmcs.com/showthread.php?82419
Steps to Apply: Upload the single file contained within the zip file to the /includes/ folder
Download Link: http://www.whmcs.com/download/526/google-graphs-api-hotfix