If the 1.3.24 patch is saying that your TSLHost.dll file is invalid...

[BobDob]

yours must have somehow become corrupt.      Try replacing the TS3.exe and TSLHost.dll in your "The Sims 3/Game/bin" directory with the following two files and do the patch again.  These are the 1.2.7 version of those files that the 1.3.24 patch is looking for.

http://www.mediafire.com/?sharekey=55e7bd3c5171ea4a41446e35a78dc463e04e75f6e8ebb871

Please make sure that these are the actual files that the patch is crapping out on.  Search for a file called "rtpatch.log" on your hard drive.  You'll probably find multiple ones, so only look at the most recent file.  If it says that the TSLHost.dll file is invalid, then use the two files that I linked above.

[Tgdrysix]

I have tried your suggestion and I am still getting this error...any other suggestions or advice...my game is pretty mod free still....

[Motoki]

Just uninstall and reinstall. (It will give you an option to keep your saves) Then don't touch anything and just go straight to the patch.

For US English get this one: http://akamai.cdn.ea.com/eadownloads/u/f/sims/sims3/patches/sims3_1.3.24.00001_from_1.0.631.00001.exe

For Worldwide/Razor get this one: http://akamai.cdn.ea.com/eadownloads/u/f/sims/sims3/patches/sims3_1.3.24.00002_from_1.0.631.00002.exe

If you are unable to uninstall for some reason follow the guide here.

[Tgdrysix]

Thanks it will not let me uninstall....nothing is ever easy....but I will give it a try and keep my fingers crossed.