Installation, Upgrade, and Import Support

1209 topics in this forum

1. Auto-Debit ACH

   By ejmerkel, June 20, 2014
   • 4 replies
   • 9.5k views
   • 
   • Joshua A
   • Wednesday at 02:43 PM

2. Does WHMCS support PHP 8.4?

   By Sudipto Mahmud, April 17
   • 2 replies
   • 375 views
   • 
   • WHMCS Ricardo
   • April 19

3. WHMCS Installation with utf8mb4 Database - Potential Issues & Best Practices

   By centos777, October 15, 2025
   • 4 replies
   • 1.4k views
   • 
   • theozsnowman
   • April 17

4. Migration to new host

   By Anjina Parvin, March 7
   • 3 replies
   • 927 views
   • 
   • LittleCreek
   • March 14

5. Update Error

   By hmaddy, December 1, 2025
   • 4 replies
   • 1.3k views
   • 
   • joeroot6543
   • March 13

6. Illegal invoice changes

   By ju5t, June 5, 2018
   • 24 replies
   • 19.6k views
   • 
   • Damo
   • February 23

7. Bug: When using empty 'regions' in s3 storage and upgrading, you'll run into issues

   By twhiting9275, February 17
   • 2 replies
   • 3.7k views
   • 
   • twhiting9275
   • February 19

8. Upgrade from WHMCS 8.13 to 9 doesnt clean up vendor Folders

   By ptomter, January 24
   • 3 replies
   • 978 views
   • 
   • BENELUX
   • February 11

9. Update WHMCS from 8.13.1 to 9.0 Critical Error --> Smarty: undefined extension class 'Smarty_Internal_Method_Get_Template_Vars' <--

   By SkyHost Networks, January 31
   • 6 replies
   • 1.2k views
   • 
   • Mytihost
   • February 3

10. SMTP Passwordless issue

    By Marwan9090, January 20
    • 1 reply
    • 538 views
    • 
    • RadWebHosting
    • January 25

11. old WHMCS update process planning

    By Walther, December 17, 2025
    • 3 replies
    • 1.4k views
    • 
    • zomex
    • December 22, 2025

12. Full Support

    By romerositios, November 4, 2025
    • 2 replies
    • 859 views
    • 
    • wtools
    • November 30, 2025

13. About email verification challenge for newly register client

    By Sudipto Mahmud, November 9, 2025
    • 2 replies
    • 1.1k views
    • 
    • wtools
    • November 30, 2025

14. Upgrade Error

    By hmaddy, November 21, 2025
    • 2 replies
    • 949 views
    • 
    • wtools
    • November 30, 2025

15. HOW TO UPGRADE SQL FOR CPANEL

    By BABYKEY, October 28, 2025
    • 1 reply
    • 979 views
    • 
    • RadWebHosting
    • November 4, 2025

16. Update Doubts

    By hmaddy, October 24, 2025
    • 1 reply
    • 1k views
    • 
    • WHMCS SamP
    • October 26, 2025

17. Problem with upgrading WHMCS

    By georgiathomp, October 20, 2025
    • 0 replies
    • 634 views
    • 
    • georgiathomp
    • October 20, 2025

18. SupportPal -> WHMCS

    By slim, May 30, 2025
    • 8 replies
    • 3.2k views
    • 
    • AMateos
    • October 15, 2025

19. which files to use to update whmcsdata/cron/cron.php

    By Madumi, September 3, 2025
    • 3 replies
    • 6.8k views
    • 
    • Madumi
    • September 7, 2025

20. Installation gives 404 after step 4

    By NECS, July 31, 2025
    • 1 reply
    • 1.7k views
    • 
    • WHMCS John
    • August 26, 2025

21. Update failed ERR 2

    By ROQ, July 21, 2025   

    • ERR 2
    • 4 replies
    • 1.8k views
    • 
    • bear
    • July 21, 2025

22. joomla WHMCS Client Login for Joomla

    By rcartists, July 15, 2025   

    • Installation Upgrade
    • upload
    • (and 1 more)

      Tagged with:

      • Installation Upgrade
      • upload
      • whmcs
    • 1 reply
    • 1.3k views
    • 
    • rcartists
    • July 15, 2025

23. woocommerce to whmcs

    By Muneef, May 27, 2025
    • 1 reply
    • 2.6k views
    • 
    • GOVAIO
    • June 19, 2025

24. Captcha fails on admin

    By pmtech, June 14, 2025
    • 1 reply
    • 1.4k views
    • 
    • pmtech
    • June 14, 2025

25. Update Failed: Files and database are already up to date-WHMCS 8.13.1

    By Sudipto Mahmud, June 11, 2025   

    • update
    • 2 replies
    • 1.5k views
    • 
    • WHMCS John
    • June 13, 2025