Not able to install any DB2 LUW 10.5 fixpacks I am currently on Fixpack 1 and am trying to install ANY more recent fixpack. All of them refuse to apply themselves with similar errors. The one below is from Fixpack 2 file v10.5fp2_ntx64_server. Each of them up to the most recent says that they cannot upgrade my version, but none of them provides a reason.

After reading Installation Planning link, my brain hurts after coming across of this:

DB2 must be installed on a drive with short names enabled or a directory with no spaces such as E:\DB2\SQLLIB. To check the current 8.3 file name settings for a drive, in a command window with administrator privileges, enter

fsutil.exe behavior query disable8dot3


The following possible values are returned when you run the command:

0: Create 8.3 short file names (default)
1: Do not create 8.3 file names
2: Set 8.3 file names on a per volume basis
3: Disable 8.3 file names on all volumes, except the system volume


The registry state of NtfsDisable8dot3NameCreation is 0, which means that 8.3 file names are enabled on all volumes. To enable 8.3 file names on a global basis, enter

fsutil.exe behavior set disable8dot3 0 


If DB2 is installed on a drive without 8.3 name support andin a directory without spaces, it must be reinstalled on a drive with 8.3 name support. If the folder you are trying to install DB2 is already created when 8.3 name support is disabled, then the short name is not created if you try a reinstall onto the same directory. Windows short names are created during the directory creation, hence you must install it into a new directory or if the directory is empty delete the directory and allow recreation.

On my system, the setting is at its default 2, which means &quot;per volume&quot;. I am not sure if this is the reason the fixpacks refuse to install themselves.
Does this mean that IBM essentially puts their customers into a death trap, by allowing the initial install of DB2 to place it into C:\Program Files\ but refusing to install fixpacks later? I cannot believe that this is the case. Can anyone whose DB2 runs off of C:\Program Files\ explain how we are supposed to upgrade?
UPDATE:
By running dir /x I found out that all directories in the hierarchy from c:\ down to sqllib have short names. The lack of them cannot be the reason why updates are refusing to install.
From your screenshot this is Express-C edition. It cannot be upgraded with fixpack.
See here

In my opinion your best bet is to leave it as is or plan for migration to newer version. IBM provides only newest Express-C edition from what I could gather.