I have IDA Pro 7.4 that use with Python 3.7 and I have some IDA-plugin that works only with Python 2.7.
Is there any way to run that Python 2.7 based plugin?
You can't use Python 3 and Python 2 in IDA simultaneously, but you could switch between them by following instructions in README_python3.txt
until IDA 8.0, which dropped Python 2 support.
2to3
?