Accessibility Apps Support

Hi all
I'm fairly certain (from my somewhat limited computer knowledge) that this isn't possible, but thought I'd ask in case I'm wrong.

Hi,

Since I having eye disabilities I use the enabled black based High-Contrast-Mode (high-contrast-#1 theme/design) on Windows 7 and Windows 10.

Since the installer and the updater are strictly "branded" with white background images, there is already a problem, since white as background is not that "mandatory" (MSDN rules) high-contrast support.

On Windows 7 the text in the installer or at the last updater screen is yellow and so yellow on white background image.
On Windows 10 it is white texto n white background image.

To test it on your self:

Since

DSpeech Text-to-speech on demand 3 MB Accessibility - DSpeech 3 MB

has been added to the platform, I'm trying to install but always get the error "The downloaded copy of DSpeech is not valid and can not be installed. This could be due to an incomplete download or other network issue. Please try running the updater again when complete.
"
The download seems to be a 2-step download, but the size of both is identical (which normally never is)

Today my computer at work was upgraded to Windows 10, Office 365 and OneDrive. The application manager gives me no authorization at all to install Store apps and I can not open any exe files from portable apps. Is there any other way to use portable apps?