The same thing happened to me with 6247 after I used 6248 for HBO Max ..
.. I copied all the 6247 files from my backup, but nothing changed.
A new temp folder (autocreated by SF after rename the old) worked for me - see also here
Germania
@Germania, quick question .. Do you wear a cape? Coz you certainly swoop in to the rescue like Superman lol. ;) That [was] a compliment.
Well misery loves company, so I was actually mighty relieved to read that you experienced the exact same issue after uninstalling the dreadful 6.2.4.8! Made me realise the issue [was] the new update and nothing I was doing .. ANYWAY, the reason for this is to say I've fixed it! I might not be as tech savy as most on this forum, but I will certainly not let something like this beat me without giving it a good go at resolving it.
I used (as normal) Revo Uninstaller to remove 6.2.4.7 and then followed the removal with a Forced uninstall (again through Revo), making sure anything StreamFab was completely gone from my pc. Restarted the pc and did a fresh install of 6.2.4.7 after redownloading it from my DVDFab extended download service. All personal settings were gone. I had to reauthorize the new installation. This resolved the issue, so
@Wilson.Wang, there is a serious problem with the latest update 6.2.4.8. It's bugged out and this needs serious attention as it's affecting installs of previous versions from working.
But again, as previously said, THANK YOU Germania. You. Are. Greatly. Appreciated! :)
By so many of us.