Downloadlink not working for Guest user site

Question

I have created a link on a visualforcepage for Guest user.The link shows correctly with the correct id. When I try to download the link a new page is opened with the error: urlsite/ex/errorduringprocessing.jsp'

When I do the same logged in everything works fine. To give permissions I have created 2 triggers 1 to set ContentDocumentLink.visibility = 'AllUsers' and 1 to set ContentVersion.Origin = 'C'.

No errors in my debug logs for Guest user

My url looks fine:

urlsite/sfc/servlet.shepherd/document/download/id

My visualforcepage looks like:

    <apex:page standardController="Account" extensions="AttachmentfilesExt" sidebar="false" showHeader="false">
   <apex:repeat value="{!idsContentdocument}" var="file">
        <a href="{!URLFOR('/sfc/servlet.shepherd/document/download/'+ file.ContentDocumentId)}" target="_blank"> Click here </a>&nbsp;&nbsp;&nbsp;
        {!file.ContentDocument.title} 
        <br/>
    </apex:repeat>
</apex:page>

My controller:

  public without sharing class AttachmentfilesExt{
    public List<ContentDocumentLink> idsContentdocument {get;set;}
    public Id accId;
    public AttachmentfilesExt(Apexpages.StandardController con){
        idsContentdocument = new List<ContentDocumentLink>();
        try{
            string token = apexpages.currentpage().getparameters().get('token');
            system.debug('token: '+ token);
            accId  = [SELECT id , Token__c FROM Account WHERE Token__c =:token LIMIT 1].id;
            system.debug('accId: '+ accId);
        }
        catch(Exception e){
            System.debug('An exception accId occurred: ' + e.getMessage());
        }
        try{
            system.debug('accId 2: '+ accId);
            idsContentdocument = [SELECT ContentDocument.title, ContentDocumentId,LinkedEntityId FROM ContentDocumentLink WHERE LinkedEntityId = :accId];//:con.getId()
        }
        catch(Exception e){
            System.debug('An exception idsContentdocument occurred : ' + e.getMessage());
        }
    }
}

Answer 1

For those who are looking for this solution I solved this with a map on name and ContentDownloadURL from ContentDistribution

Visualforce:

 <apex:repeat value="{!urlmap}" var="key">    
 <apex:outputLink value="{!urlmap[key]}">Click here to download</apex:outputLink>&nbsp;{!key}<br/>
   </apex:repeat>

Controller:

try{
   urlsContentDistribution = [SELECT DistributionPublicUrl, ContentDownloadURL ,name FROM ContentDistribution WHERE RelatedRecordId = :accId];
    for(ContentDistribution m:urlsContentDistribution){
        urlmap.put(m.name,m.ContentDownloadURL);
    } 
}
catch(Exception e){
    System.debug('An exception idsContentdocument occurred : ' + e.getMessage());
}