Problem with 1.8.13

Resulting from a crash, I decided to scrap all previous 1.8.xx IDE series and upload 1.8.13. Working with new projects the new IDE works well. However, I need to use the software for a project I did some years ago and I then downloaded its program (with 1.8.5) on an SD. I loaded this program without difficulty and it compiled nicely. The problem arrived when I tried to download it to the Wemos D1 for which it had been built. The download went okay but the process failed. On the serial monitor I see a whole lot of garbage!!

Displayed are 15 lines containing 8 blocks of what looks like assembler code each with five digits. At the beginning I see <<>> followed a bit later with ISR not in IRAM,then an entry shows user exception (panic/abort/assert). Thats all!!

What am I doing wrong?
Please help

Sounds like an issue with the ESP8266 core you have installed, or the specific version of it..

I think they have a forum for the Arduino core somewhere? If nobody here knows the solution, it's a sure bet that someone over there does!

Could you also take a few moments to Learn How To Use The Forum.
It will help you get the best out of the forum in the future.
Other general help and troubleshooting advice can be found here.