Restore/Preview version which was created in version 4.5.x doesn't work. It's caused by changes in metadata and by changes in images/documents (dms -> dam, in 4.5.x we also allow to upload images/documents directly to website/data/... workspace)

MetaData - to fix this it can be used info.magnolia.importexport.postprocessors.MetaDataImportPostProcessor. For example during copy source node in mgnlVersion repository to destination node in website/dam/data info.magnolia.cms.core.version.CopyUtil#copyFromVersion
images/documents - DAM module has many tasks for migrating to M5. see classes in info.magnolia.dam.setup.migration package.