Some additional things that might want to be looked into.
On my system I've update the dictionary files from:
https://cgit.freedesktop.org/libreoffice/dictionaries/plain/
or https://github.com/LibreOffice/dictionaries
The 4.80 has these files.
   97320 Feb 26  2006 cs_CZ.aff
 3764008 Mar  3  2006 cs_CZ.dic
      98 Jun 27  2013 cs_cz.v5dict
   18638 Jun 21  2011 de_DE_igerman98.aff
 1042541 Jun 21  2011 de_DE_igerman98.dic
     115 Jun 23  2013 de_DE_igerman98.v5dict
   27449 May 26  2005 en_gb.aff
  527337 May 26  2005 en_gb.dic
     100 Jun 19  2013 en_gb.v5dict
    3045 May  4  2007 en_US.aff
  696131 May  4  2007 en_US.dic
      95 Jun 23  2013 en_us.v5dict
  157439 Dec  2  2008 es_ES.aff
  830974 Dec  2  2008 es_ES.dic
      94 Jan 30  2014 es_es.v5dict
  399013 Jan 19  2011 fr-classique+reforme1990.aff
 1127681 Jan 19  2011 fr-classique+reforme1990.dic
     135 Jun 27  2013 fr-classique+reforme1990.v5dict
I now have these.
   111575 Mar 25 22:17 cs_CZ.aff
  3656362 Mar 25 22:17 cs_CZ.dic
       98 Jun 27  2013 cs_cz.v5dict
   312076 Mar 25 22:31 de_DE_frami.aff
   123528 Mar 25 22:31 de_DE_frami.dic
      107 Mar 25 22:38 de_DE_frami.v5dict
    32955 Mar 25 22:03 en_GB.aff
  1157761 Mar 25 22:03 en_GB.dic
      100 Jun 19  2013 en_GB.v5dict
     3090 Mar  1  2022 en_US.aff
   551762 Mar  1  2022 en_US.dic
       95 Jun 23  2013 en_us.v5dict
  1851362 Mar 25 22:22 es_ES.aff
 14046755 Mar 25 22:23 es_ES.dic
       94 Jan 30  2014 es_es.v5dict
  1807735 Mar 25 22:27 fr.aff
   123204 Mar 25 22:27 fr.dic
       68 Mar 25 22:35 fr.v5dict
Not sure what the v5dict files do? 
en_us.v5dict has
Name : US English Dictionary
DictFile : en_us.dic
AffFile : en_us.aff
Charset : ISO-8859-1
Have seen something that dictionaries changed to UTF8 instead, but pages don't have v5dict files, so might be something Mr. Harris added??
I also updated the LIBHUNSPELL.DLL
4.80 has 375296 Jun 28  2013 LIBHUNSPELL.DLL
I have 381032 Jan 23  2014 LIBHUNSPELL.DLL
There are newer versions up to 1.7x but it switch from 32bit to 64 bit after the one I found from 2014??  Don't know if the 32bit Pegasus could call a 64bit DLL? 
Had created a self-extracting 7z file with the new dictionaries?
2564227 Mar 26 04:01 DICTS.exe
Don't do much with spell checking, but was just interested if newer version of DLL and dictionaries might be around?? Something to play with.
 
        Some additional things that might want to be looked into.
On my system I've update the dictionary files from:
https://cgit.freedesktop.org/libreoffice/dictionaries/plain/
or https://github.com/LibreOffice/dictionaries
The 4.80 has these files.
   97320 Feb 26  2006 cs_CZ.aff
 3764008 Mar  3  2006 cs_CZ.dic
      98 Jun 27  2013 cs_cz.v5dict
   18638 Jun 21  2011 de_DE_igerman98.aff
 1042541 Jun 21  2011 de_DE_igerman98.dic
     115 Jun 23  2013 de_DE_igerman98.v5dict
   27449 May 26  2005 en_gb.aff
  527337 May 26  2005 en_gb.dic
     100 Jun 19  2013 en_gb.v5dict
    3045 May  4  2007 en_US.aff
  696131 May  4  2007 en_US.dic
      95 Jun 23  2013 en_us.v5dict
  157439 Dec  2  2008 es_ES.aff
  830974 Dec  2  2008 es_ES.dic
      94 Jan 30  2014 es_es.v5dict
  399013 Jan 19  2011 fr-classique+reforme1990.aff
 1127681 Jan 19  2011 fr-classique+reforme1990.dic
     135 Jun 27  2013 fr-classique+reforme1990.v5dict
I now have these.
   111575 Mar 25 22:17 cs_CZ.aff
  3656362 Mar 25 22:17 cs_CZ.dic
       98 Jun 27  2013 cs_cz.v5dict
   312076 Mar 25 22:31 de_DE_frami.aff
   123528 Mar 25 22:31 de_DE_frami.dic
      107 Mar 25 22:38 de_DE_frami.v5dict
    32955 Mar 25 22:03 en_GB.aff
  1157761 Mar 25 22:03 en_GB.dic
      100 Jun 19  2013 en_GB.v5dict
     3090 Mar  1  2022 en_US.aff
   551762 Mar  1  2022 en_US.dic
       95 Jun 23  2013 en_us.v5dict
  1851362 Mar 25 22:22 es_ES.aff
 14046755 Mar 25 22:23 es_ES.dic
       94 Jan 30  2014 es_es.v5dict
  1807735 Mar 25 22:27 fr.aff
   123204 Mar 25 22:27 fr.dic
       68 Mar 25 22:35 fr.v5dict
Not sure what the v5dict files do? 
en_us.v5dict has
Name : US English Dictionary
DictFile : en_us.dic
AffFile : en_us.aff
Charset : ISO-8859-1
Have seen something that dictionaries changed to UTF8 instead, but pages don't have v5dict files, so might be something Mr. Harris added??
I also updated the LIBHUNSPELL.DLL
4.80 has 375296 Jun 28  2013 LIBHUNSPELL.DLL
I have 381032 Jan 23  2014 LIBHUNSPELL.DLL
There are newer versions up to 1.7x but it switch from 32bit to 64 bit after the one I found from 2014??  Don't know if the 32bit Pegasus could call a 64bit DLL? 
Had created a self-extracting 7z file with the new dictionaries?
2564227 Mar 26 04:01 DICTS.exe
Don't do much with spell checking, but was just interested if newer version of DLL and dictionaries might be around?? Something to play with.