InstallAgent.exe and InstallAgentUserBroker.exe missing

It is two or more years that I am unable to update or install new apps from Store. The log reports:

Code:

Nome registro: Application
Origine:       Windows Error Reporting
Data:          11/10/2018 16:18:31
ID evento:     1001
Categoria attività:Nessuna
Livello:       Informazioni
Parole chiave: Classico
Utente:        N/D
Computer:      Thunder
Descrizione:
Bucket errato , tipo 0
Nome evento: StoreAgentDownloadFailure1
Risposta: Non disponibile
ID CAB: 0

Firma problema: 
P1: Update;Microsoft.WindowsStore_8wekyb3d8bbwe
P2: 80070002
P3: 17763
P4: 55
P5: Windows.Desktop
P6: N
P7: 
P8: 
P9: 
P10: 

File allegati:
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC9F.tmp.WERInternalMetadata.xml

I file potrebbero essere disponibili qui:
\\?\C:\ProgramData\Microsoft\Windows\WER\ReportQueue\NonCritical_Update;Microsoft_7f31cf52508f2d6e626d5a9168013eef518cf7_00000000_0893ac8f

Simbolo analisi: 
Nuova ricerca di soluzioni: 0
ID rapporto: cfc4c4e8-a277-4a3e-8d40-918ceb0a47b2
Stato rapporto: 100
Bucket con hash: 
GUID CAB: 0
XML evento:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows Error Reporting" />
    <EventID Qualifiers="0">1001</EventID>
    <Level>4</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2018-10-11T14:18:31.878826500Z" />
    <EventRecordID>15982</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Thunder</Computer>
    <Security />
  </System>
  <EventData>
    <Data>
    </Data>
    <Data>0</Data>
    <Data>StoreAgentDownloadFailure1</Data>
    <Data>Non disponibile</Data>
    <Data>0</Data>
    <Data>Update;Microsoft.WindowsStore_8wekyb3d8bbwe</Data>
    <Data>80070002</Data>
    <Data>17763</Data>
    <Data>55</Data>
    <Data>Windows.Desktop</Data>
    <Data>N</Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC9F.tmp.WERInternalMetadata.xml</Data>
    <Data>\\?\C:\ProgramData\Microsoft\Windows\WER\ReportQueue\NonCritical_Update;Microsoft_7f31cf52508f2d6e626d5a9168013eef518cf7_00000000_0893ac8f</Data>
    <Data>
    </Data>
    <Data>0</Data>
    <Data>cfc4c4e8-a277-4a3e-8d40-918ceb0a47b2</Data>
    <Data>100</Data>
    <Data>
    </Data>
    <Data>0</Data>
  </EventData>
</Event>

Basically, it reports a generic error 80070002 related to StoreAgentDownloadFailure1.

Believe me, it is a waste of time to list ALL the dozens of solutions I've already tried multiple times each, even a in place upgrade and creating a new user (which led me to more problems, but I already fixed that).

The news is that now I've read that InstallAngent.exe and InstallAgentUserBroker.exe are responsible for updating apps through the store. Well, I just noticed that I do not have these files in my System32 folder nor in any other folder. Is this normal or what?

Windows 10 Home x64 v1903 b18362.387.

Any ideas or suggestions, please?

Clear and Reset Store Cache in Windows 10

Note this shows the same symptoms. (Above is pg 6- below is pg 1)

Suggested solution:
Clear and Reset Store Cache in Windows 10

I do not have those files: