In your situation, I would consider creating a new user on my computer to switch between 'users' instead of un-installing and re-installing all the time
The nice thing about Adobe CC, is you're able to download older copies on your computer.
From the Adobe CC desktop menu, scroll up/down to find the section "FIND ADDITIONAL APPS", click on the "Previous Versions" drop menu and choose "VIEW PREVIOUS VERSIONS".
From the same Adobe CC desktop menu, click on InDesign "Install" button to access previous versions, this way you may download InDesign CC (2014) or CC (2017) but before you download, switch your Language to "English يدعم العربية" from the Preferences.
You may proceed to download InDesign CC (2014) with Arabic / Persian / Urdu capabilities now and have both InDesign versions on the same machine. This way you may run both InDesign versions at the same time if needed hence keeping your English version. But don't forget to switch Creative Cloud language in the Preferences menu back to English.
One thing you ought to be aware of, is when you create or edit a document in InDesign with Middle Eastern options, it is better to continue to work on it on the same version. Well the reason being when you open your document in an English InDesign version after it was created or edited and saved in a Middle Eastern (ME) InDesign, all punctuations such as full stop, question mark, and the like will appear at the wrong position of the line.
From experience, it is better to start and complete the job on the same InDesign ME version or English version till exporting it to PDF.
ME version have it English interface. By the fact ME is an extended English version. Why you need to switch between? Use it "ME" version and don't worry about it.
Hi - has the advice for switching changed?
I managed to change preferences and install ME version. But when I have tried to go back, I face the same problem as the original poster. On my CC there is no option to install older versions? HELP!