It's cumulative. So, you just need to install the latest hotfix for CF 9.0.1.
Please follow the update instructions carefully; and perform backups.
I understand it's cumulative, but in the cumulative hotfix (CHF) 4 it doesn't mention to remove hf901-00010.jar, so that's not part of this latest cumulative hot fix.
The issue I'm concerned about is that the install for hotfix 4 has part of the CFIDE and WEB-INF folder, so I will need to overwrite some of those files with CHF4.
Will those overwrite any files that were created by hotfix APSB13-13 which installed hf901-00010.jar?
Will i be ok with just installing CHF4 just as the installation instructions say, or will I need to re-install hotfix APSB13-13?
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I expect after you apply CF9.0.1 CHF4 you will need to re-apply the file changes (eg CFIDE\admin*) that are part of APSB13-13. Be sure to remove the CHF1 JAR file from CF9\lib\updates.
Note there is also a APSB13-19 which has a CF Jrun patch.