You've done all the legwork to confirm that 8.8 P5 will not remove that version of Sophos. Thank you.
The proper procedure to have the uninst.ini updated, from an existing customer standpoint, is to submit a PER.
However, you can edit the .ini file but not in a supported fashion .
Perhaps you were getting errors because you're editing the copy on the ePO server? That won't work.
If you edit a standalone copy of the install files, you should be OK (unless you're being tripped up by the syntax or structure of the INI file itself).
If it's an ePO deployable package you're needing then the process is much more complicated and I'm not at liberty to share it. I would instead direct you to the PER submission process.
It was indeed the Uninst.ini on the EPO server. I assume that is probably the problem. I do not want to mess with stand alone installers as the intention moving forward is to utilize the EPO agent to pull all required products via policies.
My company is currently an Enterprise customer, we just have minimal penetration on the endpoints.
Where would I start for a PER submission? Do I need to contact our account rep?