Description:
Using the Extension Manager from the Tools manager it is not possible to load the extension. I was able to load extension dictionaries for German, French and Italian so it is not that the extension loading system is not working. I downloaded and tried to install the following 5 versions:
dict-en-20200301.oxt
dict-en-20200301.oxt
dict-en-20200201.oxt 
dict-en-20191101.oxt
dict-en-20190901.oxt

Each time the extension installed is assayed the following error message is the result: 

Add Extension(s):
/home/memyself/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu24206sx9eq5.tmp_/dict-en-20191101.oxt does not exist.


Actual Results:
see above

Expected Results:
expected to see a notice something like: extension installed.


Reproducible: Always


User Profile Reset: No



Additional Info:
(A most awkward bug reporting system - - - - is that why bugs exist in such measure and for such extraordinary amounts of time? Is such a fragmented documentation system because not only the fixing but also the reporting is expected to be done by automata?)