v5.48.6834 downloads but does not instal. What next?
See if this helps
The link to download & install cctrialsetup.exe provided in the Support Knowledgebase article that Forum Mod @hazelnut linked here worked like a charm to update both of my paid versions of CCleaner Professional Plus, and the explanation for the minor Certificate change behind this isolated snafu was welcome as well. Thanks for the good work, and the continuing level of superior support that Piriform provides.