Installing V16 fails

[SLS]

Hi All happy Christmas.
I Have finaly decided to upgrade to V16 from 11.4 with my Mobile. I have unistalled all the V11.4 and rebooted many time
but it fail say that a previouse version is is still installed and camnnot install Titan engine
PC is 16G of Mem, 500G SSD 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz 2.42 GHz, Windows 11 Home
Acer Aspire C22.
Any help would be appreciated, Ive attache SCren shot of warning
I have gone over this many time and removed software turned of virus must be missing somthing

[icke_siegen]

I'd manually remove the folders C:\Program Files\Avolites and C:\Program Files (x86)\Avolites (the latter would also contain TitanSwitch if you have this installed -- delete all the subfolders apart from TitanSwitch then). If this doesn't help then please come bak -- we'd have to tweak the registry.

[SLS]

Hi thanks for the help. I have deleated both folders in programs and programs 86, also removed any titan folder but still have the same problem.
I also remove switch as its no longer required as I dont think can us it with V16.
Many thanks again

[icke_siegen]

I sent you a private message which describes what you need to do.

Btw. I have Titan switch in use for switching between any version between v11 and v17 at the moment