Forums / Cotonti / Support / Trying to update from Genoa, red fatal errors big time.

1. For any experiment get you originnal (Genoa) site (I suppose you had backuped it) and run it on localhost. 

2. Uninstall any addition genoa plugins. I also recommend to move all addirion plugins and modules files to separete temporary folder.  

3. Then drop Siena files over your site

4. Make a backup copy of your site MySQL datbase.

5. run install ( as manual says). 

If typed erros still occures then

6. restore DB from backup copy, then

7. look in «setup» folder and locate file with problem script — 

ALTER TABLE `cot_cache` ADD COLUMN `c_realm` …

in your case. I think it sholud be `patch-genoa.sql` file. Then comment these lines with /* */ signs and try install ones more.

If you get another SQL error then repeats steps 6, 7 until install will had been completed.

8. After that you can enable Genoa compatibility plugin (named «genoa»).

9. Move back old Genoa plugins one by one, install them through admin and check whether it works or not.

10. If ome plugin not working — uninstall it, then be sure that these functions are not included in the core. Then search for analog in plugins section of this site (or ask users).

 If main functions of site seems to be working  you can upload site to working server.