diff --git a/DESCRIPTION b/DESCRIPTION
index 4ba0c28..ec88448 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -33,7 +33,7 @@ Imports:
     dbplyr,
     dplyr,
     logger,
-    pacta.data.preparation (>= 0.1.0.9002), 
+    pacta.data.preparation (>= 0.1.0.9003), 
     pacta.data.scraping, 
     pacta.scenario.preparation, 
     readr, 
diff --git a/run_pacta_data_preparation.R b/run_pacta_data_preparation.R
index e6dcca4..6ea8e07 100644
--- a/run_pacta_data_preparation.R
+++ b/run_pacta_data_preparation.R
@@ -155,24 +155,39 @@ factset_timestamp <-
 
 # check that everything is ready to go -----------------------------------------
 
-stopifnot(file.exists(masterdata_ownership_path))
-stopifnot(file.exists(masterdata_debt_path))
-stopifnot(file.exists(ar_company_id__factset_entity_id_path))
-stopifnot(file.exists(factset_financial_data_path))
-stopifnot(file.exists(factset_entity_info_path))
-stopifnot(file.exists(factset_entity_financing_data_path))
-stopifnot(file.exists(factset_fund_data_path))
-stopifnot(file.exists(factset_isin_to_fund_table_path))
-stopifnot(file.exists(factset_iss_emissions_data_path))
-stopifnot(file.exists(factset_issue_code_bridge_path))
-stopifnot(file.exists(factset_industry_map_bridge_path))
-stopifnot(file.exists(factset_manual_pacta_sector_override_path))
-stopifnot(file.exists(data_prep_outputs_path))
+input_filepaths <- c(
+  masterdata_ownership_path = masterdata_ownership_path,
+  masterdata_debt_path = masterdata_debt_path,
+  ar_company_id__factset_entity_id_path = ar_company_id__factset_entity_id_path,
+  factset_financial_data_path = factset_financial_data_path,
+  factset_entity_info_path = factset_entity_info_path,
+  factset_entity_financing_data_path = factset_entity_financing_data_path,
+  factset_fund_data_path = factset_fund_data_path,
+  factset_isin_to_fund_table_path = factset_isin_to_fund_table_path,
+  factset_iss_emissions_data_path = factset_iss_emissions_data_path,
+  factset_issue_code_bridge_path = factset_issue_code_bridge_path,
+  factset_industry_map_bridge_path = factset_industry_map_bridge_path,
+  factset_manual_pacta_sector_override_path = factset_manual_pacta_sector_override_path
+)
 
 if (!update_currencies) {
-  stopifnot(file.exists(currencies_data_path))
+  input_filepaths <- c(
+    input_filepaths,
+    currencies_preflight_data_path = currencies_preflight_data_path
+  )
 }
 
+missing_input_files <- input_filepaths[!file.exists(input_filepaths)]
+
+if (length(missing_input_files) > 0L) {
+  logger::log_error(
+    "Input file cannot be found: {names(missing_input_files)} ({missing_input_files})."
+  )
+  stop(
+    "Input files are missing: ",
+    toString(missing_input_files)
+  )
+}
 
 # pre-flight -------------------------------------------------------------------
 
@@ -180,6 +195,10 @@ logger::log_info("Fetching pre-flight data.")
 
 if (update_currencies) {
   logger::log_info("Fetching currency data.")
+  input_filepaths <- c(
+    input_filepaths,
+    currencies_preflight_data_path = currencies_preflight_data_path
+  )
   currencies <- pacta.data.scraping::get_currency_exchange_rates(
     quarter = imf_quarter_timestamp
   )
@@ -191,6 +210,10 @@ if (update_currencies) {
 }
 
 logger::log_info("Scraping index regions.")
+input_filepaths <- c(
+  input_filepaths,
+  index_regions_preflight_data_path = index_regions_preflight_data_path
+)
 index_regions <- pacta.data.scraping::get_index_regions()
 saveRDS(index_regions, index_regions_preflight_data_path)
 
@@ -856,23 +879,7 @@ parameters <-
   list(
     config_name = config_name,
     config = unclass(config),
-    input_filepaths = list(
-      masterdata_ownership_path = masterdata_ownership_path,
-      masterdata_debt_path = masterdata_debt_path,
-      ar_company_id__factset_entity_id_path = ar_company_id__factset_entity_id_path,
-      factset_financial_data_path = factset_financial_data_path,
-      factset_entity_info_path = factset_entity_info_path,
-      factset_entity_financing_data_path = factset_entity_financing_data_path,
-      factset_fund_data_path = factset_fund_data_path,
-      factset_isin_to_fund_table_path = factset_isin_to_fund_table_path,
-      factset_iss_emissions_data_path = factset_iss_emissions_data_path,
-      factset_issue_code_bridge_path = factset_issue_code_bridge_path,
-      factset_industry_map_bridge_path = factset_industry_map_bridge_path,
-      factset_manual_pacta_sector_override_path = factset_manual_pacta_sector_override_path
-    ),
-    preflight_filepaths = list(
-      currencies_data_path = currencies_data_path
-    ),
+    input_filepaths = as.list(input_filepaths),
     timestamps = list(
       imf_quarter_timestamp = imf_quarter_timestamp,
       factset_data_identifier = factset_timestamp,
@@ -901,14 +908,24 @@ parameters <-
     package_news = package_news
   )
 
+logger::log_trace("Getting list of output files.")
+output_files <- normalizePath(
+  list.files(
+    data_prep_outputs_path,
+    full.names = TRUE,
+    recursive = TRUE
+  )
+)
+
+manifest_path <- file.path(data_prep_outputs_path, "manifest.json")
+logger::log_trace("Writing manifest file: \"{manifest_path}\".")
 pacta.data.preparation::write_manifest(
-  path = file.path(data_prep_outputs_path, "manifest.json"),
+  path = manifest_path,
   parameters = parameters,
-  asset_impact_data_path = asset_impact_data_path,
-  factset_data_path = factset_data_path,
-  data_prep_outputs_path = data_prep_outputs_path
+  input_files = input_filepaths,
+  output_files = output_files
 )
-
+output_files <- c(output_files, manifest_path = manifest_path)
 
 # copy in NEWs.md files from relevant PACTA packages ---------------------------
 
@@ -945,7 +962,7 @@ if (export_archives) {
   logger::log_trace("Zip file path: \"{outputs_zip_file_path}\".")
   zip(
     zipfile = outputs_zip_file_path,
-    files = list.files(data_prep_outputs_path, full.names = TRUE, recursive = TRUE),
+    files = output_files,
     extras = c(
       "--junk-paths", # do not preserve paths
       "--no-dir-entries", # do not include directory entries