I installed the Telegram Desktop client, and next I created a new folder named “C:\Users\myname\AppData\Roaming\Telegram Desktop\tdata_another”.
Then I added telegram.exe path in the PATH environment variable. This step is not mandatory but I’d rather to write “telegram” instead of “C:\Users\myname\AppData\Roaming\Telegram Desktop\telegram” in the next step.
Finally, to run two telegram instances, from the DOS prompt I wrote
C:\Users\myname>Telegram -many -workdir “C:\Users\myname\AppData\Roaming\Telegram Desktop\tdata”
followed by
C:\Users\myname>Telegram -many -workdir “C:\Users\myname\AppData\Roaming\Telegram Desktop\tdata_another”