Trying to update MRI

Windows10, 64, LO 7.5.4.2

I am trying to update MRI. When I try to uninstall the current version (1.3.3.) to install the latest Hanya I get this warning

(com.sun.star.lang.IllegalArgumentException) { { { Message = “There is no such extension deployed: org.openoffice.legacy.MRI-1.3.3.oxt”, Context = (com.sun.star.uno.XInterface) @1fd15dea830 } }, ArgumentPosition = (short) -1 }

What to do? MRI does not show as an add-on.

Does it work if you to install MRI-1.3.4.oxt wthout previous uninstall …1.3.3.oxt?

Trying to install 1.3.4 gives
(com.sun.star.lang.IllegalArgumentException) { { { Message = “Cannot detect media-type: file:///C:/Users/nigelb1/AppData/Roaming/LibreOffice/4/user/uno_packages/cache/uno_packages/lu3924rl8hg.tmp_/MRI-1.3.3.oxt”, Context = (com.sun.star.uno.XInterface) @133fae3f650 } }, ArgumentPosition = (short) -1 }

The files are there, a 1.3.3.oxt folder and a (0 kb) ‘MRI-1.3.3.oxtproperties’

Should I delete those?

Yes, you can delete the directory:
C:/Users/nigelb1/AppData/Roaming/LibreOffice/4/user/uno_packages/cache/uno_packages/lu3924rl8hg.tmp_,
but also edit the file:
C:/Users/nigelb1/AppData/Roaming/LibreOffice/4/user/uno_packages/cache/uno_packages.pmap
and delete two lines for MRI extension → ˙mytools.mri and next line lu3924rl8hg….

Kamil - many thanks for the clear instructions which I have completed and now have 1.3.4 installed.