Experimenting with a new version

[icodk]

I am using an old version of the devkit and it works fine. I would like to experiment with the newest version so I renamed the c:\Espressif folder to c:\Espressif_
However when I try to run the installation of the newest devkit (Espressif-ESP8266-DevKit-v2.2.1-x86) I get the following message:
An old version of Unofficial Development Kit for Espressif ESP8266 was detected. Do you want to uninstall it ?
If I click No the new devkit is not installed
How can I have both installed ?

[cherts]

1. Copy c:\Espressif to c:\Espressif_OLD
2. Remove older DevKit
3. Install the new version DevKit
4. Change settings in file
   c:\Espressif_OLD\utils\ESP8266\gen_appbin.py
   c:\Espressif_OLD\utils\ESP8266\gen_appbin_old.py
   replace
   cmd = 'C:\Espressif....
   on
   cmd = 'C:\Espressif_OLD
5. Run script
   c:\Espressif_OLD\utils\ESP8266\py2exe_gen_appbin.cmd
   and
   c:\Espressif_OLD\utils\ESP8266\py2exe_gen_appbin_old.cmd
6. Change path in file c:\Espressif_OLD\utils\ESP8266\udkvars.bat
   replace
   @set devkit_dir=C:\Espressif
   on
   @set devkit_dir=C:\Espressif_OLD
7. Change path in file C:\Espressif\examples\ESP8266\settings.mk
   replace
   XTENSA_TOOLS_ROOT ?= c:/Espressif/xtensa-lx106-elf/bin
   SDK_BASE ?= c:/Espressif/ESP8266_SDK
   SDK_TOOLS ?= c:/Espressif/utils/ESP8266
   EXTRA_BASE ?= c:/Espressif/extra
   on
   XTENSA_TOOLS_ROOT ?= c:/Espressif_OLD/xtensa-lx106-elf/bin
   SDK_BASE ?= c:/Espressif_OLD/ESP8266_SDK
   SDK_TOOLS ?= c:/Espressif_OLD/utils/ESP8266
   EXTRA_BASE ?= c:/Espressif_OLD/extra
8. Compile example firmware.