I have the same problem.
The latest Version A7.86.5 cause an Error E1513 Crash in main:level_load(level_str), when I try to run my level based on the Template_6-Scripts.

I tried your patch acknex7.zip and copied the two files acknex.dll and ACKWED.DTA in my gstudio7 folder.

But when I build and run my level, I first get 41 warninga (Malfuntion W1554: Material undefined) and after that I get the Error E1513: Script crash in main level_load(levelstr) again.

When I reinstall my old Version A7.85.4, I'm able to build and run my level without problems.

It's a pity that the last released A7.86.5 update is incompatible with existing Template_6 levels.
If it's not possible to solve this problem, you should better upload the version A7.85.4 as latest A7 release.
Otherwise, Gamestudio users, who don't own an old version, are not able to start existing Template_6 levels.