That happened to me on one machine. Seems like the thing to do is to manually copy the files from the network folder EvoERP is in to your local C:\ISTS folder. Here are the files I would transfer at a minimum:
 
EvoERP.exe
Tp7Runtime.exe
 
If that doesn't work and you don't need to keep your local settings you could delete the ISTS folder and rerun evo from the network and it should recreate your ISTS folder for you with the up to date runtime.
 
Anyway, that worked for me. I think I just basically copied over every file from the EvoERP folder that was also in the ISTS folder. But I think the above two files should be all you really need. YMMV.
 
 
Quote from lgrover on 06/04/07 at 10:55:47:

Hi
Thanks for the help.
What fixed the problem was deleting every thing in the local C:\ISTS folder and then coping Tp7Runtime.exe file from the dbamfg folder on the server to the local C:\ISTS folder.

When Evo loads it checks the dlls, evoerp and tp7runtime.exe to see if the date on the server is later then the one in the local c:\ists folder. If it is then the program copies the newer files to c:\ists. This way when we have updates you should only have to update the server copy and when users log in it will update their local programs. If you get the updating to newer runtime then that means we put out a new runtime. If you get there is a misatching of EVO engines then one of the files copied but not all. Copy evoerp.exe and Tp7runtime.exe from the server to the C:\ists folder manually and this will correct the error.  
 

We, too, experienced the "mismatch.." error on some machines (XP SP2 only) with the last update.  I typically just re-ran the setup and the error cleared out just fine.  Good to know that if it does not work in the future I can just manually copy over those two files.  
 
Thanks!  
 
Val

What its trying to do is copy two files from the DBAMFG or EVO folder and replace the ones in the ISTS folder. This usually takes place after a full on update. Copy the tp7runtime.exe and the evoERP.exe from the DBAMFG or EVO folder and paste them into the ISTS folder. Overwrite the ones that are there. Both files should be the exact same size and should have the same date. That should take care of the probelm.