I uninstalled LR manually and then downloaded directly from Adobe website, which installed Creative Cloud again and LR CC. I got the same error when I ran LR again. I performed the suggested fixes on the support page (changing the name of SLCache without any success. I have all versions of LR since day one and have had no problem installing ever until this version. Is there a solution or is this a bug with the program? It looks like others are experiencing similar install problems. Fortunately, my LR 5.7 is till functional or would be out of business.