Merge pull request farrellja#59 from maximilianh/patch-1

Update INSTALL.md

INSTALL.md

@@ -16,12 +16,22 @@ Following installation of R, Rstudio can be obtained and installed from [https:/
 
 ### 3. Install required R packages and URD
 
-We wrote a script that will attempt to install all requirements for URD and then URD itself. Start RStudio and then run the installation script from the console:
+We wrote a script that will attempt to install all requirements for URD and then URD itself. It has been tested on R 3.5 and R 3.6. Start RStudio and then run the installation script from the console:
 
 ```source("https://raw.githubusercontent.com/farrellja/URD/master/URD-Install.R")```
 
 ## Troubleshooting
 
+### A separate conda environment
+
+If you have trouble installing URD because of version conflicts with your currently installed packages, you can create a separate conda environment for URD:
+
+```
+conda create urd base-r==3.5.1 udunits2 -c conda-forge 
+conda activate urd
+Rscript -e 'source("https://raw.githubusercontent.com/farrellja/URD/master/URD-Install.R")'
+```
+
 ### udunits
 
 URD's dependencies require the installation of the **udunits2** package, which depends on the udunits2 library. This is part of the Windows and Mac OS X operating systems, but often requires manual installation on Linux distributions:
@@ -30,6 +40,11 @@ URD's dependencies require the installation of the **udunits2** package, which d
 sudo apt-get install libudunits2-dev
 ```
 
+Or if using conda:
+```
+conda install udunits2
+```
+
 ### DLL error
 
 R has limit on the number of DLLs that can be loaded by linked packages. If you receive a **maximal number of DLLs reached** error during installation, then you can increase the number of simultaneously allowed DLLs from 100 to 200 by modifying the *.Renviron* file.