I’ve found a few places where users have described a similar situation on similar SuiteCRM versions, where applying the patch causes the “Next” button to disappear:
Do you see any errors in either the SuiteCRM.log, upgradeWizard.log or apache logs?
Also, would you be able to re-set the file/folder permissions, and see if that resolves the issue?
If you find that you’re having similar issues as the above posts, it would definitely be worth adding your two cents onto the github issue, to further raise awareness
If re-setting permissions doesn’t seem to resolve the issue, It seems users in the above posts have had success with rolling back to a previous version, and performing the upgrade without the patch.
Or, if a server rollback is not possible, manually replacing the patched files with the previous versions of the files.
(Which could be grabbed either from the SuiteCRM github, or by downloading a version of SuiteCRM that the files previously came from)